The California Highway Patrol's Clear Lake office reported that Killilea was driving alone in a 2006 Chevrolet pickup on State Route 20 at about 5:30 p.m. "when the vehicle veered onto the north shoulder of SR-20, and up an embankment."
"The vehicle continued out of control and traveled back onto SR-20 and collided with a stone wall on the south side of the roadway," the CHP said. The car broke through the wall and overturned into the lake.
Killilea was reportedly found in the vehicle by the Northshore Fire Protection District's rescue dive team.
The CHP said the cause of the crash is under investigation, and it is not yet known if alcohol or drugs were a factor.