John Mendoza Sr. says he was asleep in the house when the shooting happened shortly after midnight Monday. Despite being at the home, he says he has not spoken with investigators or heard from the sheriff's office.
"We respect law enforcement," Mendoza said, noting that officers are part of his extended family. But he believes his son's death was unjustified and is calling for accountability as Texas Rangers lead the investigation.
Outside the family's home, a memorial now honors Mendoza Jr., who had recently completed his freshman year at Texas State University and returned home for the summer.
"It's tough. I can't believe it," Mendoza said. "I can't live without my son."
Mendoza said his son and two longtime friends had left a park where they had been exercising.
According to the Brazoria County Sheriff's Office, a deputy attempted a traffic stop near FM 2004 in Lake Jackson. Instead, Mendoza, who was driving, continued to his home about two miles away.
New surveillance video shows the vehicle entering the neighborhood during a brief pursuit. Moments later, a single gunshot can be heard.
Mendoza says his son was not threatening and unarmed while sitting in his vehicle inside the garage when he was shot.
The sheriff's office has confirmed that a deputy fired his weapon but has not released details about the reason for the traffic stop or what occurred immediately before the shooting.
"In any other situation, somebody would have been arrested for this murder. Somebody should be," said Mendoza. "What we know from the details is my son was executed. There was no reason to pull his gun."
Tuesday, Texas State University issued a statement expressing "heartfelt condolences' to Mendoza's "family, friends, classmates, and all those affected by this tragedy."
His father hopes the Texas Rangers and the Brazoria County District Attorney's Office will determine exactly what happened and whether the deputy involved should face consequences.
"I'm hopeful they do what they know is right," he said. "This was a senseless act that should not have happened."
The deputy's name has not been released.
ORIGINAL REPORT: Chase suspect killed by Brazoria County deputy after attempted traffic stop, sheriff's office says