STOCKTON (CBS13) — Investigators are searching for witnesses and trying to piece together clues in the murder of a Stockton taxi driver who was found dead early Sunday morning.

READ MORE: 15-Year-Old Suspected Of Pointing Gun At Other Student During Fight In Marysville High Bathroom

The Stockton Police Department said officers found 44-year-old Luis Palma unresponsive in the driver’s seat of his taxi near Lincoln Street and Washington Street at about 1:44 a.m., shortly after receiving a report of gunshots in the area.

Palma was pronounced dead at the scene.

READ MORE: Wanted Attempted Homicide Suspect In Custody After Chase, Crash In Roseville

Stockton Police Officer Pete Smith said investigators can’t release much information on a possible motive for the crime, but added that there is no indication Palma was doing anything other than trying to pick up a fare when he was killed.

Nearby residents reported seeing four or five women and possibly one man running away from the scene shortly after the incident, but it is not clear if they are connected to the case.

MORE NEWS: COVID Omicron Variant Detected In Vaccinated Minnesotan Who Traveled To NYC Anime Convention

Anyone with information on Palma’s death or the identities of the people seen fleeing the scene is asked to contact the Stockton Police Department at (209) 937-8323.