A Rohnert Park man has died while whitewater rafting on the North Fork of the American River near Colfax and authorities are looking into the possibility of a fatal heart attack.

The man was identified by the Placer County Sheriff’s Office as Stan Decker, 59, of Rohnert Park. Decker died Saturday afternoon, authorities said.

The Associated Press initially reported that Decker drowned after apparently trying to help two rafters who were struggling with some fast-moving rapids.

But State Parks Supervising Ranger Scott Liske of the Auburn State Recreation Area said Monday that an ashen-faced Decker was reported by onlookers to have collapsed while standing in ankle-deep water after a particularly frenetic ride both in and out of the churning whitewater.

Decker was part of a commercial rafting trip by Auburn’s Whitewater Excitement outfitters that left from the Mineral Bar put-in near the Iowa Hill Bridge at 12:15 p.m. Saturday, Liske said.

At least two boats and a kayaking outrider set out and the boat Decker was in ended up pitching four occupants out at Slaughter’s Sluice, about half a mile downstream, Liske said.

Decker was one of the rafters who wemt in after the craft hit something in the water. He and another occupant were able to get back into the inflatable rubber raft and try to help pull the other two – a man and a woman – back in, Liske said.

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