Vessel #2 was driving two boat lengths behind Vessel #1 at approximately 30 mph, just left of Vessel #1's wake.  Vessel #1, at a pretty good speed according witness,  made a quick turn to the left, right into the path of Vessel #2.  Vessel #2 operator did not have time to turn the steering wheel, but immediately pulled back the throttle in an attempt to put it in reverse.  Vessel #2 went up and over vessel #1 starting at the console area to the motor area.  Operator of Vessel #1 was first unconscious and then died.  Passenger on Vessel #1 suffered skull fractures, and damage to teeth.  Both were transported to the University of Michigan Hospital.
Witness stated that he had seen Vessel #1 earlier doing 360-degree spins then 180-degree spins, whipping back and forth. playing and having fun, at approximately 20 mph speed.  Witness had commented to his wife at the time:  "That's how people get hurt."
No alcohol involved.
Butman Township               