Milosky, 35, was found at the famous surfing spot by emergency crews who responded to a 911 call around 6:50 p.m., deputy coroner Emily Tauscher said.
He was transported to a hospital where he died at about 7:45 p.m.
Milosky was a well-known big wave surfer who was sponsored by athletic clothing company Volcom last year, according to his Facebook page.
The cause of the accident is under investigation, Tauscher said.
A YouTube video from Window Seat Pictures shows Milosky surfing.
