Arlington Cold Case Cracked After 14 Years: DNA Technology Leads to Capital Murder Arrest
A cold case that haunted Arlington investigators for more than a decade has finally reached a turning point. Authorities announced the arrest of 42-year-old Mayra Velasquez in connection with the 2012 stabbing death of Irasema Chavez Sanchez, a case that had gone unsolved since the Obama administration’s first term.
,Chavez was discovered dead with numerous stab wounds on January 20, 2012, after family members went to check on her at the Aspenwood Apartments on South Collins Street., Medical examiner records confirmed she died from multiple stab wounds in what investigators quickly recognized as a brutal and targeted killing.
,Police found no signs of forced entry at the scene, leading investigators to believe that Chavez knew her attacker., ,Surveillance footage from the night before the murder captured a person entering the apartment, but authorities were unable to identify a suspect despite pursuing multiple leads.,
,DNA evidence collected at the scene failed to match anyone in law enforcement databases at the time, and witnesses were only able to provide limited information., ,Investigators also commissioned a generative profile of the suspect, but it did not produce any viable leads., The case eventually went cold.
The breakthrough came years later through a federal partnership. ,Homicide detectives met with the FBI Dallas Field Office in November 2024 to discuss using the bureau’s Investigative Genetic Genealogy program and secured the agency’s agreement to assist., ,Earlier in 2026, that collaboration produced a significant lead that detectives used to develop further evidence.,
,Velasquez was arrested by the Arlington Police Department and charged with capital murder., ,Public records show she was taken into custody on July 16 and is being held without bond., ,Records also show that Velasquez is a licensed real estate agent with Pure Realtors LLC.,
,Court records indicate Velasquez is represented by attorney Vincent Carrizales., Authorities have not publicly disclosed the specific nature of the new evidence that led to the arrest warrant.
Criminologist Dr. Alex Del Carmen noted that DNA technology in 2012 was far less capable than it is today. He said the limited sample pool, high costs, and imperfect methods of that era made identification extremely difficult. He added that modern DNA analysis can now reveal physical characteristics such as eye color and other biological traits with far greater precision, giving investigators tools that simply did not exist when Chavez was killed.
,For the family of Irasema Chavez, the arrest represents the first major step toward justice after more than a decade of uncertainty., Arlington police and the FBI Dallas Field Office were scheduled to hold a joint press conference to provide additional details on the investigation and the collaborative effort that led to Velasquez’s arrest.