An Anchorage man has been arrested on manslaughter charges in the Saturday death of a woman after a Mat-Su boating collision which left two other people gravely injured, according to Alaska State Troopers.

Reagan Martz, 26, is charged with manslaughter, DUI and three counts of first-degree assault in the death of 35-year-old Anchorage resident Jennifer Horazdovsky, troopers wrote in an online dispatch. The fatal collision occurred at about 3:30 p.m. on Flat Lake, adjacent to Big Lake.

Troopers said Martz was driving a boat on the lake, carrying seven people and negotiating a curve around an island, when he encountered another boat -- which was towing a raft containing three passengers, including Horazdovsky.

"Both boats were traveling head-on towards each other and turned abruptly to avoid a collision," troopers wrote. "The raft with three passengers was struck by Martz’s boat resulting in the death of [Horazdovsky] and seriously injuring the other two. Martz left the scene prior to AST arrival and was located nearby on a jet ski and was subsequently arrested for DUI."

Ken Barkley, deputy chief of the Mat-Su Borough’s emergency services, said medics including the borough’s dive team responded to Flat Lake at about 3:30 p.m., with one person declared dead shortly before 3:45 p.m.

By 4:30 p.m., Barkley said, one surviving patient had been medevaced by a LifeMed air ambulance. A second trauma patient was treated as well.

Horazdovsky's next of kin have been notified, troopers said.

Editor's note: An initial trooper dispatch on the collision said Horazdovsky was from Chugiak, not Anchorage.

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