SAN DIEGO -- Authorities Friday publicly identified a suspect in a seemingly unprovoked shooting that killed a 23-year-old man and wounded one of his friends as they drove along a back-country road in Jamul.

Joseph "Bob" Orlosky, 55, allegedly opened fire with an assault rifle on a vehicle carrying three young men on Wisecarver Truck Trail about 8:30 p.m. last Friday, according to sheriff's officials.

The attack killed construction worker Charles Crow and left another young man with minor injuries.

Shortly before the shooting, Crow and two companions had passed a parked truck while driving through the rural area, looking for a piece of property for sale, homicide Lt. Dennis Brugos said.

As the men returned to the spot on their way back, a man in a green camouflage jacket got out of the pickup with a rifle in his hands, walked to the middle of the road and fired several rounds at the victims before fleeing, investigators said.

Crow, a Jamul resident and father of a 5-month-old son, died about a half-hour later.

Investigators have identified no motive in the case.

Orlosky, who has an Oregon driver's license, is a 6-feet-1-inch-tall, roughly 195-pound white man with receding gray hair and green eyes, officials said.

He may be driving a white Ford F-250 Super Duty truck with a decal or placard affixed to its cargo bed.

Officials urged anyone with information on the suspect's whereabouts to call San Diego County Crime Stoppers at 888-580-8477. Tipsters may remain anonymous and could be eligible for a reward of up to $1,000.