Francis Frank Joseph Houle was last heard from in August 1979, when a letter he sent to his daughter was postmarked in Colorado Springs, Colorado. At 46 he was working as a ranch hand there and had kept in regular contact with his family by mail; that August letter was the last known communication before decades of silence.

An enrolled member of the Turtle Mountain Band of Chippewa Indians, he was born in Belcourt, North Dakota, and had lived in Washington state before moving to Colorado. He was a father of five (three biological, two adopted) and had divorced in 1972. Physical details from the time he disappeared list him between 5 feet 8 inches and 5 feet 10 inches, 180 to 200 pounds, with graying hair, brown eyes, prescription eyeglasses and tattoos reading Rose on one arm and Sweet and Sour on his nipples.

No missing person report or death certificate existed until his granddaughter began investigating in 2021 and filed a report; the Colorado Springs Police Department is the primary agency, with assistance from Williston, North Dakota. Does anyone have memories or records of Frank living or working in Colorado Springs in 1979, or of correspondence after August 1979?