SAN DIEGO — Police say a man was shot and killed when he stopped to help a motorist who appeared stranded along a Southern California freeway.

The Union-Tribune reports the victim was identified as 21-year-old Curtis Adams, an active duty member of the Navy in San Diego.

Officials say Adams was driving with his girlfriend south on Interstate 15 early Saturday when they spotted a man next to a vehicle stopped on the shoulder.

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San Diego police Lt. Anthony Dupree says the couple pulled over to help, and Adams was immediately shot as he exited his car. He died at a hospital.

Dupree says the shooter got back in his vehicle and drove south. Detectives are questioning a man detained a short time later near a similar vehicle that was stopped along the same freeway.

On Sunday, San Diego media reported that authorities are holding Brandon Acuna, 21, on suspicion of the slaying.