SAN ANTONIO – An officer from the San Antonio Police Department, Mark Castillo, has been arrested following an off-duty shooting incident that occurred at La Cantera in late September. This alarming event has raised questions about police conduct and accountability.
Castillo, who boasts 25 years of service and is currently assigned to the patrol division, faces charges of aggravated assault with a deadly weapon. According to the police affidavit, the situation escalated when Castillo pulled out his firearm and fired at a victim, shattering the rear window of their vehicle.
In the incident, a DoorDash driver reported that Castillo confronted him over parking issues, leading to an argument. The affidavit reveals that Castillo displayed his gun and threatened the driver by asking, “What do you want to do?” Witnesses intervened, but after the driver attempted to leave and take a picture of Castillo’s license plate, Castillo fired his weapon, hitting the driver’s car.
Previous Allegations and Concerns
This arrest is not Castillo’s first encounter with controversy. He was previously involved in a shooting incident in May 2025, where he shot a man named Sheldon Malachi Butts outside a restaurant after Butts allegedly attempted to take Castillo’s gun. In that instance, Castillo faced no charges and received no disciplinary action for his conduct.
Additionally, Castillo has been scrutinized for previous misconduct, including sending explicit texts while on duty, which led to a 30-day suspension and his removal from a security detail. These incidents raise concerns about his professionalism and judgment as a law enforcement officer.
Details of the La Cantera Incident
According to the arrest affidavit, after the initial confrontation, Castillo approached the DoorDash driver again, leading to another argument. This time, after the driver attempted to leave, Castillo fired his gun, damaging the driver’s vehicle. Surveillance footage played a crucial role in identifying Castillo as the shooter, corroborating the driver’s account.
In response to the allegations, Castillo admitted to being involved in the altercation but claimed he only displayed his weapon and did not shoot. However, video evidence contradicts his statement, showing him raising his gun before the sound of gunfire.
Current Status and Community Reaction
Following his arrest, Castillo has been placed on administrative duty as the investigation continues. This incident marks him as the 10th officer from the San Antonio Police Department arrested this year, highlighting ongoing concerns regarding police conduct within the department.
Community leaders and citizens alike are calling for greater accountability and transparency within the police force, emphasizing the importance of building trust between law enforcement and the communities they serve. As this case unfolds, many are left wondering what measures will be taken to ensure the safety and integrity of police practices moving forward.

