Willard Thomas Marks, 55, was last seen on July 10, 2005, in Topeka, Kansas. Police observed him hitchhiking and dropped him off at the intersection of 6th Street and Croco Road. He had a history of mental illness and was under the care of Valeo Behavioral Health; a caseworker reported him missing in October 2005 after not hearing from him for several months.

Family last had contact with Marks in February 2005. He had said he wanted to travel to Denver and had a history of visiting Boulder; he had also previously been treated at a state psychiatric hospital in Colorado. Marks is described as a white male, 6 feet 2 inches, about 200 pounds, with gray hair, blue eyes, and possibly a mustache or beard. His case is classified as endangered missing and his whereabouts remain unknown.

If anyone saw Willard in Kansas or Colorado after July 10, 2005, or has information about his movements between Topeka and Denver/Boulder, please share what is known.