LEMON GROVE, Calif. -- A bleeding, gravely injured man banged on the door of a Lemon Grove home in an apparent last-gasp plea for help, and his death a short time later prompted sheriff's deputies to launch a homicide investigation, authorities said Friday.
San Diego County Sheriff's deputies received a call about 9 p.m. from a resident who heard loud banging on the front door of their home in the 7600 block of Lemon Avenue, said San Diego County Sheriff's Lt. Rich Williams.
Firefighters attempted to revive the man, and he was declared dead at the scene, Lt. Ricardo Lopez of the Sheriff's Department said.
Homicide detectives were assigned to investigate the case, and the San Diego County Medical Examiner's Office was expected to perform an autopsy to determine the cause and manner of death, Williams said.
It's unclear how the man died.
A Sheriff's helicopter flying overhead was asking residents to be on the lookout for an armed person with dreadlocks and wearing a grey jacket, a black shirt and a black backpack.
Check back for updates on this developing story.