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Houston Sexual Assault Lawyer

John P. Keirnan - Experienced Sexual Assault Lawyer

For over 38 years, Houston sexual assault lawyer John Keirnan has provided aggressive criminal defense for those facing sexual assault charges. Sexual assault is a very serious offense with dire consequences for those accused. Anyone charged with sexual assault should consult with an experienced criminal attorney immediately to discuss their case and preserve any defenses they may have.


If you or someone you know is charged with sexual assault or any other sex crime, contact an experienced Houston sexual assault lawyer at Mercer & Keirnan for a free 24/7 consultation.




(713) 236-9700

Sexual Assault Attorney John Keirnan Handles All Sex Crimes

Attorney John Keirnan has successfully defended the following sex crimes:


  • Aggravated Sexual Assault

  • Failure to Register as a Sex Offender

  • Indecent Exposure

  • Indecency with a Child

  • Internet Sex Crimes

  • Online Solicitation of a Minor

  • Possession of Child Pornography

  • Prostitution

  • Solicitation of Prostitution

  • Public Lewdness

  • Rape

  • Sexual Assault

  • Sexual Assault of a Child

  • Statutory Rape


If you or someone you know is being investigated or charged with sexual assault or any other sex crime in Houston, contact an experienced sexual assault lawyer at Mercer & Keirnan Houston Criminal Defense Attorneys for a free 24/7 evaluation.




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(713) 236-9700

False Accusations in Sexual Assault Cases

A sexual assault or other sex crime conviction can mean lengthy prison sentences and lifetime registration as a sex offender, not to mention the loss of respect among your peers. No criminal charge comes with a stronger presumption of guilt than does a sexual assault.


Most people presume guilt in these cases because they assume that children and other victims would never falsely accuse someone of a sex crime. In reality, innocent people are falsely accused of sexual assault more often than the courts would like to admit. Many sexual assault cases are dismissed after further investigation by a sexual assault lawyer due to insufficient evidence.

Sexual Assault Case Makes Houston News Headlines

In 2006, sexual assault attorney John "Casey" Keirnan made Houston news headlines when he successfully argued a motion to have a sexual assault case moved out of a judge's court. Mr. Keirnan argued that the judge illegally denied his client bail, thus denying the accused his due process rights. In the motion, Mr. Keirnan noted that his client, charged with two counts of sexual assault of a child, could not receive a fair trial due to a biased and prejudiced judge who was randomly and arbitrarily denying bond to the accused in sexual assault cases.

Defense attorney John Keirnan has been making news headlines throughout his 38+ year career for the exceptional work he does as a sexual assault lawyer defending sex crimes cases in Houston. Read about other news headlines in our In the News section.

Consult with an Experienced Houston Sexual Assault Lawyer

Do not take the risk of hiring an inexperienced lawyer to defend you against a sexual assault charge or any other sex crime. These cases can be very difficult and require extensive skill and expertise that only an experienced sexual assault lawyer can provide.


Throughout his 38 year career as a criminal defense attorney, John P. “Casey” Keirnan has become a prominent sexual assault lawyer and is well known around the courthouse for his knowledge of the law surrounding sex crimes.




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(713) 236-9700


"Lawyer of the Year"

Harris County Criminal Lawyers Association (2014)

Free Case Evaluation

Request a phone call directly from Mr. Keirnan and Mr. Mercer to talk about your case.

Mercer & Keirnan

Houston Criminal Defense Attorneys

917 Franklin St #550

Houston, Texas 77002




Open 24/7


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 In addition to Harris County, we also serve:

  • Harris County

  • Fort Bend County

  • Montgomery County

  • Galveston County

  • Brazoria County

Why Hire Mercer & Keirnan

  • Over 38 Years of Criminal Defense Experience in Houston

  • 2014 Lawyer of the Year (Harris County Criminal Lawyers Association)

  • Recognized In the News nationwide as a renowned criminal defense attorney

  • We give our personal phone numbers to our clients so they can reach us easily any time

  • Avvo.com 2017 "Client's Choice"

  • Avvo.com rating of "Excellent"




  • Officer's Murder Trial Begins with Emotion, ABC7 News Chicago - Mar. 18, 2010

Disclaimer: The information contained on this site is not intended as legal advice and is solely meant for general informational purposes. Any and all interaction with this site in no way creates an attorney-client relationship unless and until an agreement is actually reached.

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