Oscar Rene Castillo Jr.

Oscar Rene Castillo Jr., a 41-year-old White man from San Antonio, Texas, was a father who neighbors in his community described as a “good guy.” He lived in the Finesilver Ranch subdivision, a gated community on the city’s Northwest Side.

On the evening of December 29, 2020, just after 9 p.m., Castillo stepped outside his home on Brentcove Street to make a phone call. He noticed a suspicious pickup truck parked in his cul-de-sac and decided to confront the driver. A brief verbal altercation broke out between Castillo and the occupants of the truck. The driver, armed with a rifle, then fired at Castillo, striking him in the chest. The truck sped away, and Oscar Castillo was pronounced dead at the scene.

The shooting stunned residents of the quiet, gated neighborhood. Investigators from the San Antonio Police Department began piecing together the events of that night. A crucial piece of evidence came from security cameras in the area, which captured the suspect's license plate as the truck fled the scene. Using this information, police were able to track down the vehicle and identify a suspect.

On January 5, 2021, authorities arrested 18-year-old Jesus Monsivais Jr. and charged him with murder. In July 2026, Monsivais, then 23, accepted a plea agreement and pleaded guilty to the murder of Oscar Castillo. State District Judge Michael Mery sentenced him to 35 years in state prison. Under the terms of his sentence, Monsivais must serve at least half of that time before he can be considered for parole. The case was closed with his conviction and sentencing in July 2026.