Open Accessibility Menu
  • TBLS Board Certified in Criminal Law

    Mark Thiessen is honored to be selected to this prestigious Criminal Law certification which distinguishes only a few attorneys as specialists.

  • Top 100 Super Lawyers in Houston - 2017-2018

    Our firm had been selectively chosen during Super Lawyers’ rigorous evaluation.

  • DUIDLA - Board Certified

    Board certification by the DUI Defense Lawyers Association (DUIDLA) is only earned by those who score a passing grade or higher on the Board Certification Exam. At Brockmeyer Law Offices, our DUIDLA Board Certification demonstrates an exhaustive, in-

  • ACS/CHAL Lawyer Scientist

    An ACS-CHAL Forensic Lawyer-Scientist is someone who used validated, legitimate science to benefit others in their pursuit of justice.

  • National College for DUI Defense

    We, along with our fellow College members, are some of the most experienced DUI defense lawyers in the nation. Only attorneys who have consistently demonstrated exceptional skill in handling DUI matters are appointed to the College.

  • The National Trial Lawyers Top 100

    We are among the nation’s most elite trial advocates, and our membership with National Trial Lawyers: Top 100 allows us to become even better through continuing legal education (CLE) programs.

  • Super Lawyers

    Super Lawyers designations are reserved only for attorneys who display a commitment to excellent client experiences and consistently positive results in court, as determined during objective review by third parties, nomination by established peers.

  • AV Preeminent Rated by Martindale-Hubbell

    AV Preeminent Ratings are awarded based on outstanding peer reviews and client testimonials. This is the highest peer rating standard in the legal industry.

  • Avvo 10.0

    A perfect score from Avvo is calculated by evaluating a firm’s experience, proven skill, track record, and client reviews.

  • Texas Criminal Defense Lawyers Association (TCDLA)

    As members of the TCDLA, we are proud to be regular participants in the Association’s educational programs.

Intoxication Manslaughter Defense in Houston

Houston DWI Attorneys Fighting for Your Freedom

Searching for a Houston intoxication manslaughter lawyer? Odds are, you need to make some tough decisions very quickly. Know that as you read this, the prosecutor is working with law enforcement to build their case against you. Mark Thiessen is among approximately 0.1% of attorneys who have won Intoxication Manslaughter trials.

What Other Lawyers Won’t Tell You

Choose your attorney carefully. Did you know very few Houston DWI lawyers have successfully tried intoxication manslaughter cases? Don’t be fooled by loud billboards or glossy commercials. At Thiessen Law Firm, we win.

Sure, there are tons of attorneys out there who know the law and practice it, but it takes a special kind of defense attorney to actually WIN a case in the District Court. The simple fact is that not every Houston attorney knows how to beat a DWI, much less intoxication manslaughter charges.

To learn more about how Thiessen Law Firm can help you, call (713) 999-3959. Your initial consultation is free.

How to Choose a Houston Intoxication Manslaughter Lawyer

Do your search carefully, yet quickly. Does this attorney have a track record of beating charges of intoxication manslaughter in Houston or Texas?

While intoxication manslaughter cases do not occur often, we have successfully tried DWI cases just like yours. Read About Our Recent Case in the Media: Not Guilty, Quadruple Intoxicated Manslaughter.

You only have 15 days to
save your license!

If you've been arrested for a DWI or DUI in the state of Texas, you are facing two cases against you. The first one is the criminal case by the state of Texas, and the other is by the Texas Department of Public Safety to suspend your license.

Learn More

Fighting Intoxicated Manslaughter Charges in Houston, TX

Why does selecting the best attorney matter so much? In Texas, a first-conviction DWI charge alone can put you $2,000 in the hole and take away your driver’s license for up to one year. Meaning if you are being accused of intoxication manslaughter, you had better get a strong team to stand behind you—one that will fight for you and your freedom. An intoxicated manslaughter conviction is at least 2 years, up to 20 years, in prison and a $10,000 fine for each fatality. The Judge can stack the sentences.

Further, if you’ve been charged with intoxication manslaughter in Houston you need to know what the stakes are here. Intoxication manslaughter charges are taken much more seriously — and rightfully so.

In Texas, intoxicated manslaughter charges are classified as second-degree felonies. That means defendants can be charged with the following:

  • Fines that reach up to $10,000
  • Prison sentences that range between 2 and 20 years
  • 240 hours of community service with room for an additional 800 hours at the State’s discretion

If the penalties listed above weren’t enough, other factors can quickly snowball against you. For example, facing a DWI second offense, or already being on DWI probation could quickly bring enhanced charges against you. In fact, there are some legislators that are pushing to make life in prison a potential penalty for intoxication manslaughter in Texas.

Assemble Your DWI Defense Team

There are two crucial characteristics that set us apart from other Houston intoxication manslaughter lawyers. First, Mark Thiessen is one of the only defense attorneys that has the title of Lawyer-Scientist and is Board Certified in DUI Law by the DUI Defense Lawyers Association.

That means he is not only trained extensively in the court of law, but also in scientific approaches to examining — and finding scientific flaws — in evidence. It’s no secret that the technologies that law enforcement is using to convict people with DWI and intoxication manslaughter charges are outdated and faulty at best.

Mark has extensive training in scientific approaches that have won some of Houston’s most famous intoxication manslaughter defense cases, including a case that acquitted on not one, not two, not three, but FOUR counts of intoxicated manslaughter.

So what’s next? If you find yourself accused of intoxicated manslaughter, you know what to do. Contact us online or call (713) 999-3959. We’ll start fighting for your freedom and reputation immediately.

Free Consultation

Please call or complete the form below and we will respond back as soon as possible.

713.864.9000 Get Started Now Available 24 hours a day, 7 days a week.
  • "The BEST Attorney in Harris County!!"
  • "If You Want a GREAT Lawyer, Mark Thiessen is Your Man"
  • "The Best Lawyer in the Industry"
  • "Excellent Attorney to Have Represent You"
  • "Fantastic Lawyer!"
  • "Best DWI Lawyer out there!"
  • "Mark Thiessen Has The “IT” Factor"
  • "Amazing, Reliable and Superb Attorney! The Great Mark Deserves 100% Marks"
  • "You Cannot Compare Anybody with Mr.Mark!"
  • "Mark Eres Mi Hombre Que Luchó Por Mi Libertad y Justicia!!!"
  • "When you really need somebody to defend you I recommend you go hire Mark Thiessen."
Read Our Testimonials


Not Guilty Verdicts
  • .171 Breath Test - Not Guilty
  • 0.119 Blood Test - Not Guilty
  • 0.158 Blood Test - Not Guilty
  • 0.146 Breath Test - Not Guilty
  • 0.176 Breath Test - Not Guilty
  • 0.184 Blood Test - Not Guilty
  • 0.10 Breath Test - Not Guilty
  • 0.194 Blood Test - Not Guilty
  • 0.16 Breath Test - Not Guilty
  • 0.199 Blood Test - Not Guilty
  • 0.140 Breath Test - Not Guilty
  • 0.098 Blood Test - Not Guilty
  • 0.127 Breath Test - Not Guilty
  • Not Guilty - Not Guilty
  • 0.144 Breath Test - Not Guilty
  • 0.172 Breath Test - Not Guilty
  • .24 Breath Test - Not Guilty
  • Intoxicated Assault - Dismissed
  • .17 Breath Test - Dismissed
  • .22 Blood Test - Dismissed Mid Trial
  • .16 Breath Test - Dismissed
  • 0.161 Blood Test - Not Guilty
  • No Test, No Accident - Not Guilty
  • .16 Blood Test - Not Guilty
  • .21 Blood Test - Not Guilty
  • 0.226 Blood Test - Not Guilty
  • Intoxicated Manslaughter - Not Guilty
  • DWI - Not Guilty
  • DWI Breath Test .10 - Not Guilty
  • 0.138 Blood Test - Not Guilty
See Our Results
Request Your Free eBook

A Texas DWI Can Cost You $15,000

Get the DWI facts no Texan should drive without, including:
  • 3 rights you can exercise when you get pulled over
  • How to save your license from suspension
  • Why you should refuse any roadside tests
  • What to say during your booking
This isn't a valid email address.
Please enter your email address.

Meet Our Legal Team

As one of Houston’s most distinguished criminal defense firms, Thiessen Law Firm emphasizes quality over quantity. We will get to know your case better than anyone and will utilize every tool at our disposal to secure the results you need. We are dedicated to your needs – 24 hours a day, 7 days a week. As soon as you hire us, you will receive the direct contact information on everyone on your case.

Meet Our Team
Prev Next

Recent News & Updates

  • Dec 17, 2018 by: Mark Thiessen

    DWI during the Holidays - What Every Driver Needs to Know

    Read More
  • Jan 11, 2019 by: Mark Thiessen

    Your Guide to DWI Fines in Texas

    Read More
  • Jan 26, 2019 by: Mark Thiessen

    Mandatory Blood Draw in Texas

    Read More

Request Your Free Consultation

Fill out the form below or call (713) 999-3959 and we'll get back to you shortly.

  • Please enter your First Name.
  • Please enter your Last Name.
  • This isn't a valid phone number.
    Please enter your phone number.
    You entered an invalid number.
  • This isn't a valid email address.
    Please enter your email address.
  • Please make a selection.
  • Please enter a message.