Three-year-old Jeffrey Andrew Dupres vanished from his front yard in Slave Lake, Alberta, on April 24, 1980. He had asked to go next door to play and was last seen leaving the yard just before 1:00 p.m.; about twenty minutes later the neighbor’s son returned alone and reported Jeffrey never arrived. At the time he was wearing a long-sleeved beige t-shirt with brown trim, rust-colored pants, and dark brown orthopedic shoes.

Early response was delayed after a call to the Royal Canadian Mounted Police cited their duty to a nearby wildfire; an officer did not arrive at the home for over an hour. Hundreds of volunteers, high school students and later members of the Canadian Armed Forces searched town and surrounding areas by ground and air but found no trace. Multiple witnesses reported seeing a man and woman in a blue 1978–1980 GMC or Chevrolet short-box pickup with chrome wheels; one witness said a woman coaxed and then grabbed Jeffrey before the vehicle sped away. Descriptions of the pair were vague.

Investigators have kept the case open and say there is a chance Jeffrey was abducted and may have been raised without knowing his identity. His mother has continued public advocacy and private fundraising to keep the investigation alive. If anyone knew Jeffrey, his family, or saw a blue 1978–1980 GMC or Chevrolet short-box pickup in Slave Lake on April 24, 1980, please come forward with information.