
St. Louis Felony DWI Lawyer
Trusted Legal Defense for Serious DWI Charges
If you’ve been charged with a felony DWI in St. Louis, you’re likely facing serious legal consequences that can have a lasting impact on your life, career, and freedom. At The Hammer Law Firm, LLC, we understand what’s at stake. Our experienced St. Louis felony DWI lawyers are committed to providing aggressive and strategic defense for those accused of felony-level drunk driving offenses throughout the greater St. Louis area.
Call (314) 334-3807 or contact us online today for a free, confidential consultation and start building your defense.
What is a Felony DWI?
Driving While Intoxicated (DWI) in Missouri becomes a felony when certain aggravating circumstances are present. While most first and second DWI offenses are misdemeanors, a DWI can be charged as a felony under Missouri law in cases involving repeat offenses, injuries, death, or other serious factors.
A felony DWI is not just a more serious classification—it carries the possibility of extended prison time, heavy fines, license revocation, and long-term damage to your record and reputation. Missouri categorizes felony DWIs into various "persistent," "aggravated," and "chronic" offender statuses, each carrying heightened penalties.
Understanding whether your DWI qualifies as a felony—and what level—is critical to building your defense. That’s where an experienced St. Louis felony DWI attorney from The Hammer Law Firm, LLC comes in.
Common Types of Felony DWI in Missouri
There are several ways a DWI can rise to the level of a felony in Missouri. Below are the most common types:
Third or Subsequent DWI Offense
If you have two or more prior DWI or related alcohol/drug driving offenses, your next DWI will likely be charged as a felony. Missouri law labels repeat offenders as:
- Persistent Offender (third offense) – Class E felony
- Aggravated Offender (fourth offense) – Class D felony
- Chronic Offender (fifth offense) – Class C felony
- Habitual Offender (five+ prior intoxication-related traffic offenses) – Class B felony
DWI Causing Injury or Death
If a person is injured or killed as a result of drunk driving, the DWI becomes a felony under different classifications:
- DWI Resulting in Physical Injury – Class D felony
- DWI Resulting in Serious Physical Injury – Class C felony
- DWI Resulting in Death – Class B or Class A felony depending on circumstances
DWI with a Minor in the Vehicle
Driving while intoxicated with a passenger under the age of 17 can elevate the charge to a felony, especially if the child is injured.
DWI While Driving with a Suspended or Revoked License
If your license was already suspended due to a prior DWI and you're caught driving intoxicated again, you may face felony charges.
Penalties for Felony DWI
Felony DWI penalties in Missouri are far more severe than misdemeanor cases. Below is a general breakdown by felony level:
Class E Felony (Persistent Offender):
- Up to 4 years in prison
- Fines up to $10,000
- License revocation for 5 years
Class D Felony (Aggravated Offender):
- Up to 7 years in prison
- Extended probation terms
- 10-year license denial
Class C Felony (Chronic Offender or Injury DWI):
- 3–10 years in prison
- 10-year license revocation
- Mandatory alcohol treatment
Class B Felony (Habitual Offender or DWI Causing Death):
- 5–15 years in prison
- Permanent license revocation
- Possible denial of probation or parole
Class A Felony (Multiple Deaths or Extreme Negligence):
- 10–30 years or life imprisonment
- No probation eligibility
Additional penalties can include mandatory installation of an ignition interlock device, substance abuse evaluation, community service, and more.
The severity of these punishments highlights why securing qualified legal representation is essential. At The Hammer Law Firm, LLC, our St. Louis felony DWI lawyers fight to reduce or dismiss charges whenever possible and protect your future.
Felony DWI FAQs
Can a felony DWI be reduced to a misdemeanor in Missouri?
It’s possible in some cases, particularly if there are flaws in the prosecution’s evidence or if the offense is on the borderline between classifications. An experienced defense attorney may negotiate a plea to a lesser offense, depending on the circumstances.
Will I lose my driver’s license after a felony DWI in Missouri?
Yes, felony DWI convictions typically result in long-term license revocation—often five or ten years. In some cases, you may be eligible for a limited driving privilege after a waiting period.
Is jail time mandatory for a felony DWI conviction?
For higher-level felony DWI charges—such as those involving injury, death, or multiple prior offenses—prison time is often mandatory. However, with the right defense strategy, alternative sentencing options like probation, treatment programs, or reduced charges may be possible.
Can I get a felony DWI expunged in Missouri?
Felony DWIs are generally not eligible for expungement in Missouri. Once convicted, it remains on your criminal record for life, impacting employment, housing, and other opportunities.
What if I refused a breath or blood test?
Refusing a chemical test can result in an automatic one-year license revocation under Missouri’s implied consent law. It can also be used against you in court. However, refusals don’t always mean a conviction—legal defenses are available.
Why Choose Our St. Louis Felony DWI Attorneys?
Felony DWI charges can derail your life. You need a legal team that knows Missouri DWI laws, understands the local court system in St. Louis, and has a proven track record of fighting serious criminal charges.
At The Hammer Law Firm, LLC, we provide:
- Aggressive representation tailored to your case
- Meticulous examination of police reports and chemical test results
- Defense against constitutional violations or improper procedures
- Guidance through every step of the criminal justice process
Whether you’re facing your third DWI or have been involved in an alcohol-related accident, we are here to defend your rights and protect your future.
Contact The Hammer Law Firm, LLC at (314) 334-3807 to secure personalized, comprehensive defense for your felony DUI charge in St. Louis.

client testimonials
At The Hammer Law Firm, LLC, your satisfaction is our priority! See for yourself what our clients have to say about working with us.
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Growing up often has painful mistakes, as my son can attest to! Mark and Nicole were both sympathetic and supportive as they ...
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I cannot begin to explain in words how thankful I am that I contacted the Hammer Law Firm when I found myself facing criminal legal charges. I and my family will always be grateful beyond words for the role that Mark Hammer and The Hammer Law Firm played i
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They are professional, courteous, and respectful to both the courts and their clients. This team of professionals is not in business just for the money, they are truly out to help their clients.
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After a thorough review, Mark began to address every legal issue confronting our son, he had already done his homework, which began to bring sanity back into our family as we sat there.
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We contacted Mark Hammer for help with our son. Mark was truly amazing! He worked hard for our son, was always a text or phone call away, and we could not have asked (or predicted) a better outcome! Absolutely in awe of him.
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Thank you so much, Nicole. I have faith and believe everything that's happening is for a reason. I know everything will be fine and I believe you are going to do everything you can and I'm very grateful for it.
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I absolutely recommend Mark and Nicole to anyone who is needing more than a lawyer, but people who do genuinely care about you and who want to get the best possible outcome to get you through this difficult time.
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I just wanted to thank you again for your compassion, kindness, and support given to my family throughout this ordeal. I thank the Hammer Law Firm for not only giving my son his life back but his family as well.
- Former Client


WHY TRUST OUR ST. LOUIS CRIMINAL DEFENSE LAW FIRM?
What Makes Us Different
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We work directly with you to determine the best possible outcome based on your goals and needs. We then create personalized legal strategies to set your case up for success.
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Our attorneys pride ourselves on always being available to address any questions you have regarding your case. With our team, you aren't just a number.
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As former prosecutors who know how the 'other side' operates, we have a unique insight that allows us to set our client's cases up for success.
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The Hammer Law Firm, LLC team has more than 60 years of combined criminal law experience. We have the tools, knowledge, and resources to effectively advocate on your behalf.

When you want personal support and proven representation, you need to bring The Hammer Law Firm, LLC to the fight.