Terrence Donald Henderson was 17 when he vanished from Lac Ste. Anne near Ross Haven, Alberta on June 23, 1979. He had been with friends that day and went out alone in a canoe; that was the last time his companions saw him. When he failed to return his friends reported him missing.

Terrence was described as freckled with brown hair, about 5 feet 10 inches tall and 130 pounds. He was last seen wearing a red and blue plaid jacket, blue denim jeans, and brown shoes. Search and rescue teams spent more than 40 hours searching the area in the immediate aftermath, but he was never located.

The prevailing theory is that he drowned in the lake. The Parkland RCMP lists the case as an open missing person investigation. If anyone was at Lac Ste. Anne on June 23, 1979, or has information about Terrence’s movements that day, please come forward.