Man found dead in Diamond Bar parking lot

DIAMOND BAR, Calif. (KABC) -- An investigation is underway after a man was found dead in Diamond Bar in a parking lot on Tuesday night.

Authorities say the body of a man in his 50s was found in a vehicle in the 1600 block of Grand Avenue at 9:53 p.m. The victim was pronounced dead at the scene. His name has not been released.

A coroner will determine the man's cause of death. Officials say the circumstances surrounding the death remain unknown at this time.

Anyone with information is urged to call the L.A. County Sheriff's Department Homicide Bureau at (323) 890-5500.