Police say evidence led detectives from Parker Street to a Baker Street dumpster.
SAN ANGELO, Texas — A second person has been arrested in a San Angelo homicide investigation after police said a man’s remains were found at a landfill and traced back to a city dumpster.
Mario Valdes Troncoso Jr. was arrested on a charge of tampering with or fabricating physical evidence. Police said he is the father of Audrey Troncoso, 31, who was charged with murder in the death of Roland Matthew Sheppard, 34.
The case began June 24 when San Angelo police received information about a possible homicide at a home in the 1400 block of Parker Street. Detectives with the Criminal Investigations Division identified Audrey Troncoso as a suspect and said she and Sheppard were in a live-in relationship.
Police said Audrey Troncoso shot Sheppard in the facial area and stabbed him numerous times. Investigators said she then dismembered his body and attempted to hide the remains. Chief Travis Griffith said police first limited details so each part of the case could be properly documented.
Investigators said portions of Sheppard’s remains were recovered at the Republic Services landfill on Old Ballinger Highway. Police said the remains were connected to a dumpster in the 600 block of Baker Street, where detectives had focused after finding evidence that included bloody clothing and carpet.
Audrey Troncoso was booked into the Tom Green County Jail on a $2 million bond. Police said Mario Troncoso was accused of involvement in concealing and disposing of remains. Authorities have not released a motive.
Griffith said investigators do not believe the killing was random and said there was no known gang connection. Police also said there was no continuing threat to the public. The department said more information would be released as the investigation allows.
The homicide remains under investigation by San Angelo police. Detectives are expected to continue reviewing evidence from the home, the dumpster route and the landfill as they prepare the case for prosecutors.
Author note: Last updated June 27, 2026.