Los Angeles County Department of Medical Examiner-Coroner officials confirmed early Friday the LAPD officer was John Gasparyan.
Gasparyan was on a motorcycle when he was killed shortly before 7 p.m. Thursday on Tampa Avenue near Chatsworth Street.
Investigators said it appears the motorcycle was heading southbound as a white sedan was making a U-turn at the intersection. The motorcycle slammed into the back of that car.
The driver of the car remained at the scene and cooperated with police.
Gasparyan was transported to a nearby hospital, where he was pronounced dead.
LAPD spokesman Josh Rubenstein said the crash appears to be a "tragic accident," but officials were interviewing witnesses as the cause of the collision remained under investigation.
Los Angeles Police Chief Charlie Beck and a heavy police presence gathered at Providence Holy Cross Medical Center in Mission Hills the night of the crash.
Rubenstein said it's always difficult to investigate a crash site when it involves one of their own.
"It's the absolute worst call you can get working for this police department, having come out to a scene like this," he said. "It's an awfully sad evening here for the Los Angeles Police Department."