SAN DIEGO — A man was fatally shot Thursday in rural East County, the San Diego County Sheriff’s Department said.

Just after 8 a.m., deputies received a call about an assault with a deadly weapon in the 1000 block of Harris Ranch Road near Potrero, Lt. Chris Steffen said. Officials responded to the scene and found a 35-year-old man with a gunshot wound to his torso.

The man, who has now been identified as Kevin Stewart, was transported to the CalFire Station in Potrero, where he succumbed to his injuries while waiting for a medical transport helicopter.

Sheriff’s officials said they received information about a man who may have been involved in the incident. He had left the area in a motorhome, but was located by deputies driving westbound on Highway 94 about two miles from the scene. Deputies were able to detain the man during a traffic stop.

On Friday, sheriffs identified the detained individual as 38-year-old Richard Arnold and said he has since been arrested for murder. The suspect was booked into the San Diego Central Jail.

Authorities say Stewart and Arnold were acquaintances that lived in separate motorhomes on the same property.

The weapon involved in this crime has not been recovered as of Friday.

Anyone with information about this incident is asked to call the Homicide Unit at (858) 285-6330/after hours at (858) 565-5200.  You can remain anonymous by calling Crime Stoppers at (888) 580-8477.