Authorities responded to a call around 7 p.m. near West and Shield Avenues. They say Mendiola walked out into the roadway, leading to the collision.
He was taken to Community Regional Medical Center, where he died.
A mother and her three children were in the car that hit Mendiola. She told authorities she feels terrible about the accident.
Officers are investigating if drugs or alcohol were a factor in Mendiola walking into the roadway because they smelled alcohol on him.