1 Dead, 2 Missing in Boating Accidents : Pyramid Lake: Jet skier is killed in collision with fishing craft. A man and a woman are feared drowned.

One person died and two others were presumed dead Sunday in two separate boating accidents within hours of each other on Pyramid Lake, Los Angeles County sheriff’s deputies said.

The first accident occurred about 1 p.m., when a bass fishing boat carrying three people collided with a jet-powered personal watercraft.

A 43-year-old Llano man aboard the bass boat was knocked into the water, as was the driver of the jet ski, a 22-year-old Canyon Country man, Deputy Diane Hecht said.

Minutes after the collision, Deputy Mark Shoemaker, who patrols the popular boating lake north of Castaic, pulled the Llano man, who could not swim and was not wearing a life jacket, safely from the water.

The driver of the jet ski, however, was found floating face down. Shoemaker’s partner, Deputy Joe Delia, helped pull the man from the water and began performing cardiopulmonary resuscitation.

Hecht said the man was taken to Henry Mayo Newhall Memorial Hospital, where he died about 1:50 p.m. An autopsy will be performed to determine the cause of death.

Neither man was identified.

As Shoemaker and Delia were on the dock investigating the 1 p.m. accident, boaters told them of another incident.

Witnesses told the deputies that a 19-foot, flat-bottomed jet boat with four people aboard sank about 3:30 p.m. in the Yellow Bar Cove area of the lake, Hecht said.

“The thing just sank within seconds,” she said.

When deputies arrived, they found debris floating on the surface, and Shoemaker donned diving gear to search the area. Two people--a 23-year-old Sylmar woman and a 30-year-old San Fernando man--were able to free themselves from the sinking boat and were pulled from the water by rescuers.

They were taken to Newhall Memorial hospital for treatment of cuts and hypothermia, Hecht said. Two others aboard the boat--a man and a woman--were not found, despite the efforts of rescue workers who dove to depths of 100 feet.

By nightfall, the search for the pair was called off. It is expected to resume this morning.

Both accidents are under investigation.