JACKSON, Wyo. (AP) — A National Park Service report says a 23-year-old Utah man who lost his life guiding kayakers on Yellowstone Lake last summer spent at least 30 minutes in the cold water before being pulled out by rescuers.

Timothy Conant, of Salt Lake City, was trying to assist a client who had overturned while on a June outing when he rolled his own kayak into water estimated to be about 43 degrees (6 Celsius).

The Jackson Hole News & Guide reports that Conant remained in the water as two other guides towed the client to shore. When one of the guides went back for Conant, he was floating motionless.

Conant was pronounced dead after resuscitation efforts failed to revive him.

His death was the first fatality in Yellowstone Lake in 20 years.

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Information from: Jackson Hole (Wyo.) News And Guide, http://www.jhnewsandguide.com