Firm Overview


Mayr Law, P.C.’s Victoria-based attorney Sierra Hatley brings personalized attention, diligence, and knowledge of the law to the region’s clients. The firm was founded by board-certified criminal attorney Brent Mayr in 2010. Together, Sierra and Brent bring decades of experience to the aid of citizens facing accusations for numerous crimes including DWI, assault, drug crimes, and murder.

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Areas of Expertise

State and Federal Criminal Defense

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All matters pertaining to criminal law are handled by Mayr Law P.C. such as the following:


Driving While Intoxicated (DWI) is one of the most commonly prosecuted criminal offenses.  In Texas, a person commits the offense of DWI when they operate a motor vehicle in a public place while intoxicated.  “Intoxicated” means either (A) not having the normal use of mental or physical faculties by reason of the introduction of alcohol, a controlled substance, a drug, a dangerous drug, a combination of two or more of those substances, or any other substance into the body; or (B) having an alcohol concentration of 0.08 or more.  A person convicted of DWI faces a punishment of up to 180 days in jail and/or a $2,000 fine.  With prior convictions for DWI, possible punishments range from up to 1 year in jail and/or a $4,000 fine for a second conviction, from 2 to 10 years in prison and/or a $10,000 fine for a third conviction, and, in some case, up to Life in Prison.

Sierra Hatley has unique experience and training relating to the prosecution and defense of DWI.  She has represented numerous Texas clients charged with every kind of DWI and has secured positive results, including a number of case dismissals and acquittals. As a former prosecutor, Brent Mayr made his mark as head of the Vehicular Crimes Section of the Harris County District Attorney’s Office.  The Section — responsible for handling cases where intoxicated and/or reckless driving resulted in serious bodily injury or death — put Brent Mayr at the forefront of high profile DWI cases. Media outlets from all over the State of Texas would routinely turn to Mayr Law to discuss and comment on issues involving the investigation and handling of DWI cases.


When a person operates a motor vehicle in a public place while intoxicated and by reason of that intoxication causes the death of another by accident or mistake, that person commits the offense of Intoxication Manslaughter.  If that intoxication causes serious bodily injury to another by accident or mistake, the offense is Intoxication Assault.  A person convicted of Intoxication Manslaughter faces punishment anywhere from 2 to 20 years in prison and/or up to a $10,000 fine.  A person convicted of Intoxication Assault faces punishment anywhere from 2 to 10 years in prison and/or up to a $10,000 fine.

These types of offenses are the most difficult for a person to face.  Given the prevalence in Victoria County of alcohol-related motor vehicle fatalities, law enforcement and prosecutors are extremely vigilant in investigating crashes, seeking convictions, and securing long prison sentences against individuals charged with these types of offenses.

Sierra Hatley’s unique experience combined with Brent Mayr’s knowledge gained as former head of the Vehicular Crimes Section of the Harris County District Attorney’s Office puts Mayr Law, P.C. in a position to provide unparalleled legal representation in these types of cases.  Sierra and Brent have represented a number of individuals charged with these offenses and can fight to get the best possible outcome.


Aside from motor vehicle crashes caused by drinking and driving, law enforcement and prosecutors also investigate and prosecute individuals who cause crashes as a result of negligent and reckless driving not related to intoxication.  Using general homicide laws, individuals who by reckless acts or criminal negligence cause the death of another face charges of Manslaughter or Criminally Negligent Homicide, respectively.  Possible punishment could be anywhere from 6 months in state jail up to 20 years in prison and/or up to a $10,000 fine.  Additionally, a person who races a motor vehicle that results in death could be prosecuted for that offense and face anywhere from 2 to 20 years in prison and/or up to a $10,000 fine.

Motor vehicle accidents that result in a death are tragedies that touch people’s lives.  An even greater tragedy potentially occurs, however, when law enforcement attempts to classify these accidents as crimes.  Emotions run high, political pressures exist, and a person in this circumstance needs someone who has been on the front line of investigating, prosecuting and defending these types of cases.  Sierra Hatley and Brent Mayr have represented numerous individuals charged with these offenses and can fight to get the best possible outcome, even potentially keeping charges from ever being filed.


Assault is any form of harm inflicted upon another person, typically categorized into two types: simple and aggravated assault. In Texas, assault doesn’t necessarily have to be physical. Although the general definition of assault is ‘any intentional, reckless, or known’ actions to bring harm to another person, In some cases, assault can also be in the form of verbal threats.

Penalties for assault vary depending on the degree of the offense. For simple assault, it can lead to 1 year of prison time and a fine of up to $4,000 if proven guilty. Meanwhile, penalties for aggravated assault can be worse ranging from 2 to 20 years of prison time and up to $10,000 in fines.

On top of that, the defendant is bound to face crippling collateral damage whether the case is dismissed or not. Allegations like sexual assault carry a tremendous social stigma. Whether guilty or not, defendants find their lives forever altered by these accusations.

If you have been charged with any type of Assault in Victoria, Texas, and Victoria County, Sierra Hatley, can help you understand the charges against you and develop a strong strategy in your defense.


A person commits criminal homicide if he intentionally, knowingly, recklessly, or with criminal negligence causes the death of an individual.  Criminal homicide is murder, capital murder, manslaughter, or criminally negligent homicide.

A person commits Murder if they: (1) intentionally or knowingly causes the death of an individual; (2) intends to cause serious bodily injury and commits an act clearly dangerous to human life that causes the death of an individual; or (3) commits or attempts to commit a felony, other than manslaughter, and in the course of and in furtherance of the commission or attempt, or in immediate flight from the commission or attempt, he commits or attempts to commit an act clearly dangerous to human life that causes the death of an individual.  A person convicted of Murder could be punished by imprisonment anywhere from 5 to 99 years or life in prison and/or up to a $10,000 fine.

A person commits Capital Murder if the person commits Murder, as described above, and, among other circumstances, either (1) the person murders a peace officer or fireman who is acting in the lawful discharge of an official duty and who the person knows is a peace officer or fireman; (2) the person intentionally commits the murder in the course of committing or attempting to commit kidnapping, burglary, robbery, aggravated sexual assault, arson, obstruction or retaliation, or terroristic threat; (3) the person commits the murder for remuneration or the promise of remuneration or employs another to commit the murder for remuneration or the promise of remuneration; (4) the person murders more than one person during the same criminal transaction or pursuant to the same scheme or course of conduct; (5) the person murders an individual under six years of age; or (6) the person murders another person in retaliation for or on account of the service or status of the other person as a judge or justice of the supreme court, the court of criminal appeals, a court of appeals, a district court, a criminal district court, a constitutional county court, a statutory county court, a justice court, or a municipal court.  A person convicted of Capital Murder faces imprisonment up to life without the possibility of parole or the death penalty.


A person commits Manslaughter if they reckless cause the death of another.  A person convicted of Manslaughter could be punished by imprisonment anywhere from 2 to 20 years in prison and/or up to a $10,000 fine.

A person commits Criminally Negligent Homicide if they cause the death or another by criminal negligence.  A person convicted of Criminally Negligent Homicide could be punished by imprisonment anywhere from 6 months to 2 years in a state jail or, under certain circumstances, from 2 to 10 years in prison and/or up to a $10,000 fine.

Mayr Law, P.C. has handled every type of these homicides.  These cases require an enormous amount of knowledge related to scientific, factual issues such as cause and manner of death and other investigation techniques, as well as legal issues such as defenses, justifications, and mitigating circumstances.


White collar crimes cover a large spectrum of offenses that are generally associated with some level of sophistication. They can involve defense against a variety of offenses involving fraud, deceit, or illegal transactions and primarily have a financial motivation. They include criminal activities such as public corruption, bank fraud and embezzlement, money laundering, fraud against the government, corporate fraud, securities and commodities fraud, mortgage fraud, and health care fraud.

Whereas defense against a crime like murder or sexual assault requires a thorough investigation of and familiarity with witnesses and investigation techniques, white collar crimes are typically “paper-intensive” requiring large amounts of time and effort to review documents including bank records and other financial documents. They also involve complex legal issues that include protected privacy rights, and knowledge of complex and difficult-to-find regulations.

Brent Mayr has represented individuals in a variety of white-collar cases in both state and federal court. He has kept criminal charges from being filed against targets of these types of investigations. He has secured dismissals and acquittals for individuals who have been indicted for these types of offenses. With over 20 years of experience dealing with white-collar cases, Brent Mayr and Sierra Hatley of Mayr Law, P.C. have the strength, tenacity, knowledge, and experience to obtain favorable outcomes for their clients.


Sierra Hatley and board-certified criminal defense attorney Brent Mayr can assist clients all throughout the state of Texas. The dedicated and experienced team at Mayr Law, P.C. handles many areas of criminal defense law, including;

  • Hit And Run Defense. Those who flee the scene of a car accident, even if they did so out of fear, could face charges of a “hit and run”. These cases can become complicated, and require a skillful and knowledgeable defense attorney.
  • Domestic Violence. Spousal abuse is a sad reality of many marriages, and facing accusations of having mistreated one’s partner can destroy someone’s life. These cases require an attorney who understands all aspects of domestic abuse law.
  • Juvenile Crimes Defense. When students or minors are accused of crimes, their education and future could be at stake. Families facing this situation need the strong defense of an attorney who will fight for their rights.

Our Attorneys

Sierra Tabone
Sierra Hatley
Associate Attorney

Sierra Hatley is an Associate Attorney at Mayr Law, P.C. working out of the Victoria, Texas office. Prior to coming to Mayr Law, P.C., Sierra Hatley worked for some of the top criminal defense firms in Houston, San Antonio, and Victoria, Texas, working on and assisting in trial with numerous misdemeanor and felony trials in state and federal court.

Meet Sierra
Brent Mayr
  • Brent Mayr

    My extensive experience means I can proactively take steps to advocate for you and your best interests. Any lawyer can request an offense report and show up to court. I am going to use my enormous resources to go well beyond that. From investigators to experts, I am going to do everything – and look for everything – to provide the very best defense to the client and get them the best possible outcome.

    Meet Brent

    “I had a breakdown caused by my PTSD from being in the Marine Corps for 23 years. Instead of getting the help I needed, the police came and I was arrested. Thanks to Sierra’s hard work and efficiency, my case was dismissed and I’m able to work my current job as a high school teacher. Mayr Law represents the people. I will forever be grateful for what they did for me.”

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