Merced police arrested the teen last week. The shooting happened on February 10 on West 11th and M Streets around 3:15 pm.
Police believe the victim, a 22-year-old Adrian Llamas, was sitting in his car when the teenager shot him. Investigators said the shooting was gang-related.
The Merced County District Attorney's Office says the murder charges against the teen were filed in a juvenile court, but prosecutors have petitioned for the case to be tried in adult court.