Investigators are still trying to determine what led to a snowmobile crashing into a dock at high speed.
Around 10:15 p.m. Saturday emergency crews responded to the Muskoka Wharf in Gravenhurst after the vehicle hit a steel dock.
40-year-old Dennis Totten of Gravenhurst succumbed to his injuries while his passenger, a woman, was treated for minor injuries at an area hospital.
Investigators remained in the area for several hours overnight.
A post-mortem examination will be scheduled later this week.