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Criminal Defense Lawyer in Belleville, IL

Former Prosecutor.
Fierce Defender
Aggressive criminal defense representation protecting the rights of the accused across Southern Illinois.
• 15+ Years Experience • 50+ Trials to Verdict • Former Prosecutor
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CALL (618) 277-2421

Former Prosecutor

Nearly a decade as a prosecutor — rose to Chief of the Criminal Bureau.

You Get Erin

No hand-offs. Erin handles every step of your case personally.

50+ Trials

Cases tried to verdict across every category of criminal defense.
ABOUT THE FIRM

Belleville Criminal Defense Lawyer

Getting arrested doesn’t just mean facing criminal charges. Those criminal charges threaten your career, family, and freedom. Whether you were arrested on suspicion of DUI, violent crimes, drug charges, or theft, you need a Belleville criminal defense attorney to help you fight back against the prosecution.

The Conner Law Firm provides aggressive and calculated criminal defense representation in Belleville and St. Clair County, Illinois, led by former prosecutor Erin K. Conner who brings 15+ years of trial experience and insider knowledge of how the prosecution builds its case. Our understanding of what happens on the prosecution side of the case against you is an asset we use to build a strong defense to fight these charges and preserve your freedom.

“I’ve sat on both sides of the courtroom. I know how prosecutors build their cases, and I know how to take them apart. When your future is on the line, you deserve someone who will fight like it’s personal — because to me, it is.”

– Erin K. Conner, Founder
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CALL (618) 277-2421

Why Choose a Former Prosecutor for Your Defense?

Choosing an experienced criminal defense attorney is a smart move when facing any kind of criminal charge. Even smarter, choosing a former prosecutor gives you distinct advantages over choosing other defense lawyers:

  • Insider Insight and Strategy: Only a former prosecutor knows how other prosecutors think and function. They can anticipate their strategies and pinpoint weak areas in a case.
  • Case Evaluation: Defense attorneys who previously served as prosecutors can quickly analyze a case to find any flaws in evidence or procedural errors police have made, which could lead to charges being dropped.
  • Trial and Courtroom Experience: Having handled numerous cases on the prosecution side, they are seasoned at trial and comfortable in a courtroom.
  • Negotiation Skills: Former prosecutors often have established relationships with law enforcement and other prosecutors, which can often work out with favorable plea negotiations.
  • Anticipating Tactics: These defense lawyers know the pressure current prosecutors face and how they decide to bring charges, allowing for strategy preparation of your defense.

Erin K. Conner spent 8 years as an Assistant State’s Attorney in St. Clair County, including supervising the Violent Crimes Unit and serving as Bureau Chief of the Criminal Division of the office. As a former prosecutor with extensive experience, she charged hundreds of cases. This inside knowledge of how prosecutors build their case has shaped the way she provides defense to the accused.

She has insider knowledge of plea negotiation strategies, evidence weaknesses, and courtroom tactics. With over 50 trials to verdict, she knows how to bring aggressive defense to help her clients.

When facing criminal charges, hiring a Belleville criminal defense lawyer is essential. Don’t rely on just any lawyer who takes a criminal case here-or-there, or who lacks the ability to give your case the attention it deserves. Choose the Conner Law Firm to get the strongest defense from an attorney who knows prosecution from the inside.

WHAT WE HANDLE

Criminal Defense Practice Areas
We Handle

DUI Defense

DUI Defense

While a first-time DUI in Illinois is usually charged as a Class A misdemeanor, it can become an aggravated felony DUI for repeat offenses, if it causes someone else injury, or happens with a child in the car. Our Belleville DUI defense lawyer fights to minimize penalties of jail time, fines, and suspension of driving privileges.
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Violent Crimes

Violent Crimes

Murder, armed robbery, home invasion, and aggravated battery are violent crimes that Illinois law treats with severity. Mandatory prison sentences, particularly when firearms are involved, are a common punishment. With a violent crimes defense attorney in Belleville from our firm, we handle these high stakes charges, fighting to protect you from lengthy prison terms.
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Domestic Violence

Domestic Violence

From domestic battery, violation of an order of protection, to stalking, a first offense of domestic violence is often charged as a Class A misdemeanor. The circumstances surrounding a charge can amplify these charges to high-class felonies. Erin uses her former prosecution experience to provide strong domestic violence defense in Belleville.
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Sex Offenses

Sex Offenses

Sex offenses in particular carry a major stigma, and even harsher penalties. If convicted, you may face mandatory prison sentences ranging anywhere from 4 years to life, depending on the allegations, in addition to lengthy or lifetime registration as a sex offender or sexual predator. Many people who are arrested on these charges are falsely accused or misidentified. Our vigorous defense against these allegations can help clear your good name and protect your freedom and livelihood.
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Guns & Weapons

Weapons Charges

Illinois has strict gun laws, and our criminal defense firm often sees clients who face charges for Unlawful Use of a Weapon (UUW) and Aggravated Unlawful Use of a Weapon (AUUW). Our defense focuses on where the prosecution will focus to find a clear path for reducing charges or dismissal.
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Drug Crimes

Drug Crimes

From possession to manufacturing and delivery, Erin has seen illegal searches and seizures that can challenge these accusations and prevent the loss of your freedom.
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Property Crimes

Theft and Property Crimes

Convictions for theft and property crimes are among those that can impact your future employment. We challenge the prosecution’s evidence to protect you from having retail thefts and burglaries on your record.
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Misdemeanors

Misdemeanors may seem like low-level offenses but they can still result in jail time and large fines. Whether you’re accused of assault, battery, disorderly conduct or any other offense, where appropriate, we work to secure outcomes like court supervision, and diversion programs to avoid harsher penalties.
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Traffic Offenses

Traffic Offenses

When you’re charged with committing serious traffic violations like driving on a suspended license, leaving the scene, or reckless driving, you can face mandatory imprisonment or loss of driving privileges for an extended term. Erin fights to ensure her clients maintain their ability to drive and avoid the serious consequences associated with conviction for misdemeanor and felony traffic offenses.
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Juvenile Defense

Juvenile Defense

Those under the age of 18 often make errors in judgment that could follow them around for the rest of their lives. The Conner Law Firm provides juvenile defense and expungement and record sealing in Belleville to give juvenile defendants the best chance at learning from their mistakes and moving into adulthood with freedom.
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If you or a loved one are facing criminal charges in Belleville and St. Clair County, IL, get the aggressive defense you need backed by the knowledge and experience of Erin K. Conner to protect your legal rights.

View All Practice Areas

Facing Criminal Charges in St. Clair County or Southern Illinois?

Don’t wait. The earlier you have an experienced defense attorney reviewing your case, the stronger your position.

SCHEDULE A CONSULTATION
CALL (618) 277-2421
YOUR DEFENSE STRATEGY

How Our Criminal Defense Process Works

After an arrest, that doesn’t mean it’s the end of the line. The Conner Law Firm immediately gets to work on your behalf from start to finish in the criminal defense process. Here is what you can expect working with Erin K. Conner:
STEP01

Free, Confidential Consultation

Contact The Conner Law Firm for a free consultation that is always completely confidential. We will review your charges, conduct an evidence review, and look for options in your defense.

STEP02

Investigation

After a thorough evidence review of what the prosecution has, we interview witnesses, review police reports, and gather any additional evidence that could help reduce charges or even fully clear your name.

STEP03

Pre-Trial
Motions

Certain evidence may have been obtained unlawfully, and we can file motions to have it suppressed, which may even work to dismiss these charges.

STEP04

Negotiation or
Trial

Whether a plea deal is in your best interest or seeing what the verdict is at trial, The Conner Law Firm always works to pursue your best possible outcome.

When you choose The Conner Law Firm, you’re not leaving anything to chance. Many firms pawn you off on a paralegal or associate. Here, you get Erin herself to defend you, armed with her extensive knowledge from working on the prosecution side to level the playing field.

TRIAL EXPERIENCE

Criminal Defense Experience in St. Clair
County & Southern Illinois

The Conner Law Firm does not publish guaranteed outcomes. Erin K. Conner has tried more than fifty cases to verdict and brings prosecution and defense experience to every case she handles.
50+ Trials
Tried to Verdict

Experience with murder, armed robbery, DUI, sex offenses, domestic violence, weapons charges, juvenile matters, and misdemeanors.

Former Prosecutor
Criminal Bureau Chief

Former Supervisor of the Violent Crimes Unit and Chief of the Criminal Bureau in the St. Clair County State’s Attorney’s Office.

Defense Counsel
Both Sides of the Aisle

Erin has handled felony, misdemeanor, juvenile, post-conviction, and criminal appeal matters from both prosecution and defense perspectives.

Disclaimer: Past results do not guarantee future outcomes. Each case depends on its own facts and circumstances.

Learn About Erin’s Trial Experience
IN THE NEWS

Belleville Criminal Defense Attorney As Seen In The News

THE DIFFERENCE

Why Belleville Clients Choose The
Conner Law Firm LLC

01

You Get
Erin

When you retain The Conner Law Firm LLC, you retain Erin. No farming to associates, paralegals, or staff. She handles every step — consultation, hearings, discovery, court dates, negotiations, plea, trial, sentencing.

02

Former
Prosecutor

Nearly a decade as a prosecutor in St. Clair County. Rose to Supervisor of the Violent Crimes Unit and Chief of the Criminal Bureau. Knows how cases get charged and how the state prepares for trial.

03

Local
Advantage

Lifelong Belleville resident who knows the judges, prosecutors, and diversionary programs — Drug Court, Veterans Court, Mental Health Court, Second Chance Probation, and more.

04

Integrity &
Reputation

When Erin files a motion, prosecutors know it’s not boilerplate — she’s analyzed the facts and believes she has a winning argument. Also honest with clients about realistic outcomes.

05

Elite
Communicator

Competitive speaker since age 10. Four-time national champion in Speech & Debate. Thrives in front of judges and juries — articulate, persuasive, and impossible to ignore.

Talk to a Belleville Criminal Defense Lawyer Now

Prosecutors start building their case the moment you’re arrested. Get Erin on your side now.

SCHEDULE A CONSULTATION
CALL (618) 277-2421
PROVEN TRACK RECORD

Proven Criminal Defense Record — 50+ Trials to Verdict

  • 50+ — Cases Tried to Verdict (murder, armed robbery, DUI, sex offenses, domestic violence, weapons)
  • 15+ — Years as Prosecutor & Defense Attorney
  • Countless — Acquittals, Dismissals & Favorable Dispositions

What Follows the Charge Defines the Outcome.

CLIENT REVIEWS

What Clients Say About The
Conner Law Firm

Google Reviews
5.0★★★★★(7)

Review us on Google

G
Google reviewer ✓
Google review · May 2026
★★★★★

Had a difficult case and when no one else knew anything she was there to help and knew the steps to take. Even after she was already paid and business was taken care of she was still there to talk with if I needed anymore help. She is awesome she’s one of the best.

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MC
Marshall Conner ✓
Google review · May 2026
★★★★★

Erin mostly does criminal defense, but she did a great job with my powers of attorney for both healthcare and property. I have recommended her to other family members and friends for traffic tickets, DUIs, and felonies. I’ve also seen her in trial on multiple occasions, and she is prepared, persuasive, and fearless.

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OP
OMON PHILIP ✓
Google review · April 2026
★★★★★

I had a great experience with Erin Conner and The Conner Law Firm. She handled my traffic case professionally and was able to get it dismissed, which I truly appreciate. Communication was clear throughout the process, and everything was handled smoothly without stress on my end. I felt confident knowing my case was in good hands. I highly recommend her services to anyone needing legal assistance. Thank you again for your help.

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TA
Timothy Abernathy ✓
Google review · March 2026
★★★★★

Erin Connor is a first class attorney, and a great person too. She went above and beyond what most attorneys would’ve done for my case. She went and did an excellent investigation of the allegations against me, and did a thorough investigation, unlike the detective who was in charge of the case. She walked around a dirty, stinky dumpster, in high heels and a dress, to prove my innocence.Erin took pictures, and measurements of the area that was in question. Erin talked to witnesses, which the detective didn’t, and she proved that the allegations against me were false. Erin went that extra mile for me in my case, and I’m very grateful for her honesty, and hard work that she put into my case. She made the accuser look like a fool in court. I would highly recommend Erin to anyone who needs a good attorney. I’m more thankful than I can express.

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SC
Steven Clark ✓
Google review · March 2026
★★★★★

Erin Conner is an excellent attorney and stellar human being. She is very skilled, knowledgeable, communicates every step of the way, and treats clients with dignity and compassion.

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G
Google reviewer ✓
Google review · February 2026
★★★★★

Erin is extremely knowledgeable, intentional, and experienced. She helped me through my case and impressed me in every step of the way. She was very professional and most important of all when choosing an attorney, trustworthy. She sticks to her word and delivers. I would recommend her to any friends or family.

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Your Case Deserves / Undivided Attention

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CALL (618) 277-2421
Former prosecutor. Criminal defense attorney. Local advocate.
MEET YOUR ATTORNEY

Meet Your Belleville Criminal Defense Attorney

Erin K. Conner is the founder of The Conner Law Firm LLC and a former Chief of the Criminal Bureau at the St. Clair County State’s Attorney’s Office. She personally handles every matter she accepts, bringing more than fifteen years of courtroom experience and insight from both sides of criminal cases.

Learn More About Erin K. Conner
WHERE WE PRACTICE

Counties and Courts We Serve

Recently arrested and accused of a crime? It’s not just the kind of attorney you choose to come to your defense. Where they work truly matters for understanding the jurisdiction.

The Conner Law Firm represents those facing criminal charges throughout Southern Illinois, with a primary focus on St. Clair County. Erin has extreme familiarity with this area as well as Monroe County, Randolph County, Perry County, Washington County, Madison County, and Bond County.

She additionally represents clients throughout Southern Illinois including cases in Clinton, Fayette, Franklin, Jefferson, Jersey, Macoupin, Sangamon, and Williamson. Whether you’re out on pretrial release or you have one phone call to make, the smart move is contacting Erin K. Conner who knows these areas inside and out and brings her extensive knowledge to every case she defends.

LEGAL INSIGHTS

Illinois Criminal Defense Blog — Legal
Insights from a Former Prosecutor

What Does a Theft Crimes Attorney Do?
The Conner Law Firm06 Jan 2026

What Does a Theft Crimes Attorney Do?

Theft and property-crime charges can follow you long after the case ends. A defense attorney reviews the evidence, intent issues, witness accounts, and possible paths to protect your record.
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What Should I Do After Being Charged With a Sex Crime?
The Conner Law Firm27 Jan 2026

What Should I Do After Being Charged With a Sex Crime?

Sex-crime accusations carry immediate personal and legal consequences. Before speaking with investigators or trying to explain your side, protect your rights and speak with defense counsel.
Read More
How Serious Is a Drug Possession Charge in Illinois?
The Conner Law Firm10 Feb 2026

How Serious Is a Drug Possession Charge in Illinois?

Drug possession charges can affect your freedom, employment, license, and record. The Conner Law Firm examines the stop, search, seizure, lab evidence, and available defenses.
Read More
Why Hiring a Belleville Assault Defense Attorney Matters
The Conner Law Firm24 Feb 2026

Why Hiring a Belleville Assault Defense Attorney Matters

Assault and violent-crime allegations can move quickly in Southern Illinois. Learn how a former prosecutor evaluates the State's evidence, police reports, witness credibility, and defense strategy.
Read More
View All Blog Post
COMMON QUESTIONS

Frequently Asked Questions

How much does a criminal defense lawyer cost in Belleville?

Like most things in life, you get what you pay for. Fees for a criminal defense lawyer in Belleville will vary widely based on the practitioner’s experience with the practice area and amount of attention they intend to give your case.

With that, your expectations should vary as well. Erin K. Conner provides a level of representation and attention to the cases she takes that justify the price of premium service. Prices are specific to your case, and the strategies that will be necessary to achieve the best possible outcome.

What should I do if I’m arrested in St. Clair County?

If you are arrested in St. Clair County, or any other Illinois County, you should protect your rights by remaining silent, not consenting to searches, and demanding to speak to your lawyer.

Officers are trained to elicit incriminating statements and get one version of the story that supports the decision to seek charges. What may seem harmless to you in the moment may be the thing that gets you charged. No one talks their way out of charges, but you can certainly talk your way into a much more complicated legal situation.

Can a former prosecutor really help my defense?

Yes, you gain many strategic advantages by hiring a former prosecutor in your criminal defense. In addition to her years of criminal defense, Erin K. Conner brings deep insider knowledge of how the state builds cases, looking for weak spots and procedural errors that otherwise may go unnoticed. She’s also familiar with local judges, prosecutors, and courtroom staff, which tends to allow for more informed plea negotiations and what moves the proverbial needle in a case.

The respect Erin has earned runs deep with those in the local court system, positively influencing how your case is handled.

What is the difference between a misdemeanor and a felony in Illinois?

In Illinois, a misdemeanor is not something you want on your permanent criminal history, though it is a less serious offense than a felony. If convicted, you may face a maximum of 12 months in jail, and maximum fines can range from $1,500 to $2,500 depending on whether it is a Class A, Class B, or Class C misdemeanor.

Felony charges are far more serious and can result in being sent to a state penitentiary for a year or more. Felonies are more likely to carry long-term, life-altering consequences such as the loss of your right to possess a weapon, rights to certain federal benefits, and can harshly impact your career and social standing.

Any type of conviction has the potential to cause you job loss, especially if your career requires a professional license. You may not be able to find a suitable place to rent, be approved for a loan, or have other consequences that go beyond the punishments of these charges.

Contact The Conner Law Firm for Your Defense

Facing criminal charges after an arrest can be an uncertain time where your future and freedom remain in jeopardy. Get the answers you need through strong representation with The Conner Law Firm, providing aggressive criminal defense representation in St. Clair, Monroe, and Madison Counties, and throughout southern Illinois.

Led by former prosecutor Erin K. Conner, your strategic defense is backed by her over 15 years of trial experience and insider knowledge of how prosecutors build their cases. The Conner Law Firm fights for your rights in every courtroom in Southern Illinois. Do not wait to get the legal representation you need to work toward a favorable outcome. Call us today at 618-277-2421 to schedule a consultation.

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  • 5111 West Main Street,
    Belleville, IL 62226
  • Phone:
    (618) 277-2421
  • Text:
    (314) 944-5553
  • Email:
    erin@theconnerlawfirm.com
  • Mon–Fri : 9am–5pm,
    After Hours : By Appointment
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