Autopsies this week will determine how two men died during the weekend while abalone diving.

Sonoma County Coroner's Sgt. Greg Stashyn Monday identified the divers as Alan Russell Rosenlicht, 57, of Oakland and Clyde Thompson, 67, of San Francisco.

The man died in separate incidents in popular diving locations along Sonoma County's northern coastline.

Rosenlicht died Sunday while diving in water off of Kolmer Gulch, near Fort Ross State Park.

He was found by other divers, on the ocean floor still wearing his weight belt, according to a state parks ranger.

The divers pulled him out and attempted to revive him but emergency responders determined he was dead at 5:11 p.m.

On Saturday Thompson had been diving in Gerstle Cove in Salt Point State Park. He was last seen by his girlfriend at 9 a.m. and hadn't returned by noon and she called to report him missing, the ranger said.

He was found floating in the water, about 50 yards from his floatation device.

Thompson was pronounced dead at 12:22 p.m.

Stashyn said it remained unclear whether the men died of a medical event or drowned. He said autopsies would be performed Tuesday.