Officers responded to a call about a shooting in the 3400 Block of South Sentous Avenue at around 10:45 p.m., according to police.
When officers arrived, they found two men with gunshot wounds.
One of them was pronounced dead on the scene while the other was sent to a nearby hospital where he later died.
Video obtained by Eyewitness News showed a heavy police presence behind the Walnut Ridge Apartments on Sentous Avenue near Amanda Street.
Footage showed investigators blocking off a carport and surrounding a silver Mercedes sedan.
It's unclear what led up to the shooting and information regarding a suspect or suspects was not immediately available.
West Covina detectives are asking anyone with information to call 626-939-8500.