Her mother is pleading for the public’s help in solving the case.
The teen was a passenger in a Mazda Miata that spun out of control before slamming into a tree.
The man was diving about 400 yards from shore and to depths of 45 feet.
The child, strapped in a car seat, was ejected from the vehicle, said Corona Fire Department Battalion Chief Jeremy Verderber.
Authorities believe that the incident was witnessed by several people and are requesting assistance from the public.
Alcohol and/or drugs were not a factor, police said.
One person was killed Friday after a vehicle struck a tree and caught on fire.
Homicide detectives Friday investigated the circumstances surrounding the shooting death of a 19-year-old man in South El Monte.
A 10-year-old female pedestrian was fatally struck by a vehicle in Adelanto Saturday evening.
A 20-year-old man suspected in a hit-and-run crash in Irvine that left a woman dead and three people injured has been arrested in Costa Mesa, police said Thursday.
Deputies Monday were on the scene of a deadly traffic collision.
The crash occurred at 2:43 a.m. on the eastbound Pomona (60) Freeway.
Officials said the suspect initially escaped to Mexico but returned to the Southland after his family and attorney urged him to come back and face the charges.
Crews Monday were on the scene of a fatal traffic collision in West Hollywood.
Paramedics rushed the man to UCI Medical Center, where he was later declared dead.