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Mount Si hiking trails are closed through the three-day Presidents Day weekend for the investigation of Wednesday’s small plane crash that killed three people.

The King County Medical Examiner’s Office says the crash killed Rob Marshall Hill, 30, Seth Dawson, 31, and Elizabeth Redling, 29.

Hill was the pilot and a flight instructor at AcuWings, a Renton flying school, but he was not on an instructional flight. An AcuWings executive, Baha Acuner, said he had no idea what they were doing.

Hill also was a swim coach at Decatur High School and Dawson coached swimming at Kentlake High School in south King County. Both also coached at Valley Aquatics in Federal Way. Redling was a friend.