Michael Robert Walczak, known as Mike, was 61 when he vanished from his secluded Wild Horse Mesa home in Costilla County, Colorado. He had moved from the Denver area and lived a rural outdoor life. He was last seen in mid-January 2005, though reports place his disappearance in the winter of 2004; the exact date is uncertain.

When family members reported him missing, deputies found his truck at the property and many personal items left behind — wallet, money, eyeglasses, jacket and boots. His dog was wandering nearby. Inside the cabin a pot with burnt food sat on the stove, propane odor was strong, and the interior appeared to have been thoroughly cleaned. Deep snow at that high elevation hampered initial searches and no trace of Walczak has been found.

Investigators with the Colorado Bureau of Investigation have said they believe foul play was involved but lack evidence to pursue that theory. The case remains unsolved and his family has never had answers. If anyone knew Michael, visited Wild Horse Mesa in 2004–2005, or saw his truck or dog then, please come forward with information.