Homicide Investigation After Man Found Unresponsive

San Marino police found a man with gunshot wounds in the trunk of a stopped sedan early Tuesday, and Los Angeles County sheriff's detectives are treating the case as a homicide. (cbsnews.com) The stop happened at about 2:30 a.m. near Los Robles Avenue and Monterey Road after an officer pulled over an older model Ford sedan for a vehicle code violation. (pasadenanow.com) (cbsnews.com) As the officer got out of the patrol car, the driver opened his door and ran east from the scene. Officers then detained a man sitting in the front passenger seat. (pasadenanow.com) (cbsnews.com) Police then discovered an unresponsive adult man in the trunk suffering from gunshot wounds to his upper torso. South Pasadena Fire Department paramedics took him to a hospital, where he was pronounced dead. (cbsnews.com) (ktla.com) The victim had not been publicly identified as of Tuesday evening. The detained passenger was described by authorities as a person of interest, not a charged suspect. (cbsnews.com) Investigators said the driver was still missing after a search of the area. The Sheriff's Department described him as wearing dark clothing, about 5 feet 6 inches tall, with a dark complexion. (pasadenanow.com) (cbsnews.com) The case shifted from an initial death investigation at the scene to a homicide inquiry after the man died at the hospital. The Los Angeles County Sheriff's Department said its Homicide Bureau is assisting San Marino police. (ktla.com) (cbsnews.com) Anyone with information is asked to call the Sheriff's Department's Homicide Bureau at 323-890-5500 or submit an anonymous tip through Crime Stoppers. (ktla.com) (pasadenanow.com)