A Canmore kayaker is presumed to have drowned after a river accident near Whistler, B.C.

Peter Thompson went missing Friday after going over a waterfall on Cheakamus River.

Canmore, Alta. kayaking coach Michael Holroyd worked with Thompson.

He said he was a very experienced kayaker who taught the sport in Canmore this past summer at the Bow Valley Kayak Club.

RCMP said Sunday the search and rescue operation has been called off.