A father and son ATV adventure in the McLean Creek area took an ugly turn Saturday, police said in a release. Their side-by-side rolled over leaving the 12-year-old boy dead.

The father was treated and released.

Cochrane RCMP, paramedics and Kananaskis Emergency Services were called to the scene just before 1 p.m.

The terrain in the area required first responders to use a long line to reach the father and son.

Both were wearing helmets and speed and alcohol are not believed to be factors.

RCMP and a Calgary medical examiner are investigating.