The victim was declared dead but later resuscitated.
The unidentified swimmer was bitten just before 9:30 a.m., authorities said.
A man was also critically wounded in the attack.
Radio legend Casey Kasem is in critical condition at a Washington hospital, according to doctors.
Police said the driver of the pickup is unlicensed. She is cooperating with authorities.
The crash — east of Palmdale — was reported just after 7:45 p.m. at 165th Street and Avenue S.
The gunman remains at large, said authorities.
Authorities say a homeless man is in critical condition after being attacked by a mountain lion in Perris.
The victim — whose name and age were withheld — was found in his truck.
Amir Wolf arrived home and pulled into his driveway when an armed male suspect approached on foot and fired.
Officials said the car should have noticeable collision damage to its front end.
Officials say the wife of a suspect has also been arrested in a hammer attack that left a Southern California high school student critically injured.
The fire at the 25-story Barrington Plaza left several people injured, including a 2-year-old girl found with her grandfather in a 23rd floor stairwell.
Four passengers were ejected in a single-vehicle crash in Bellflower on Saturday evening, according to authorities.
Authorities said an 11-year-old boy was critically burned Friday in a Compton apartment fire.