Marcus Maury McKay was eight years old when he vanished from a remote hunting area near Mallard, Manitoba, on July 15, 2000. He had been on a trip with his stepfather and three other men; after the group split up Marcus stayed with a freshly killed deer while his stepfather went to fetch help. When the men returned about an hour later Marcus was gone. He was last seen in thick woods and marshland roughly 10 kilometers north of the Mallard and Bison Roads intersection, wearing only a t-shirt and jeans despite nights that can drop near freezing.

A massive search followed, involving the RCMP, members of the Canadian Armed Forces, aircraft, search dogs and hundreds of volunteers. The terrain—swampy, densely wooded and remote—hampered efforts and some civilian volunteers had to be rescued after becoming stuck. The official search was eventually scaled back and called off, and no trace of Marcus was found. His family has continued to mark the anniversary of his disappearance, and the Manitoba Métis Federation announced a $10,000 reward and put up a billboard in 2023 to keep the case in public view. The investigation remains open and Marcus is presumed deceased.

If anyone was in the Mallard area on July 15, 2000 or has information that could help locate Marcus, please come forward.