A Fullerton man accused of fatally shooting a teen who was helping a friend change a tire is set to go on trial Thursday for murder.
Charles Thomas Ramirez Jr., 36, is accused of shooting Larry Ruiz in March 2011.
The 19-year-old was helping a friend change a tire in an alley behind Ramirez's parent's home in Fullerton, according to the Orange County district attorney's office.
The youth was allegedly confronted by Ramirez, who accused him of having been in a fight with his friend earlier that day.
When Ruiz denied being in a fight, Ramirez punched him in the face, pulled out a gun and shot him once in the head, prosecutors allege.