Ventura Police received a report of a fight on the 100 block of West Harrison Avenue at 7:45 p.m. Sunday.
Responding officers found an adult male lying on the sidewalk with a gunshot wound to his head. He was transported to Ventura County Medical Center and was listed in grave condition.
Three Hispanic males in their late teens or early 20s, wearing dark clothing were listed as suspects, according to police.
VPD Major Crimes Investigators were notified and responded to assist. Investigators believe the shooting is gang-related and were continuing investigating the incident.
Anyone with information related to the case is urged to call the Ventura Police Department at (805) 339-4441.