HIDDEN VALLEY LAKE – A Hidden Valley man reported missing after he went for a swim in Hidden Valley Lake has been found, the victim of an apparent drowning.

A report from Lake County Sheriff's Lt. Cecil Brown said that the body of Matthew Norman Kosar, 38, was found in the lake near a floating platform by sheriff's deputies and Search and Rescue volunteers on Sunday.

Brown said sheriff's deputies responded at 9:27 p.m. Saturday to a call at a Hidden Valley Lake recreation area reporting a missing swimmer.

At the scene, witnesses told deputies that Kosar entered the lake and swam to a floating swim platform, according to Brown's report. Kosar climbed onto the platform and then jumped back into the water.

After Kosar went into the water the second time, witnesses said they didn't see him again, Brown reported.

Deputies requested assistance from the California Department of Forestry, who sent a swimmer to search for Kosar under the floating platform and docks, according to Brown. A Sonoma County Sheriff’s helicopter searched the area with forward looking infra-red equipment.

After finding Kosar Sunday, authorities were able to positively identify him and notify his next of kin, according to Brown.

A coroner’s investigation was initiated, Brown's report stated. A pathologist has determined that Kosar’s death was caused by fresh water drowning.

E-mail Elizabeth Larson at This e-mail address is being protected from spam bots, you need JavaScript enabled to view it .

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