Global News crime reporter Nancy Hixt shares the latest leads in the hunt for Kelly Cook's killer.

What most people don’t know: Kelly was not the killer’s first choice. She was the “backup babysitter.”

There was one single, very important rule in the Cook home when Kelly would go babysitting: she was to call and let her parents know she had arrived safely. That call never came.

April 22, 1981 started out like a normal day in the small farming community of Standard, Alta., about 70 kilometres northeast of Calgary.