Shadden was last seen June 9, 2007 near his vacation trailer home by the E.V. Spence Reservoir. He has never been heard from again. He was reported missing June 12 after he did not return to his family in Midland, Texas, and missed work. Shadden left behind a wife and four children ranging from seven months to sixteen years old. He was employed as an instrumentation and electric technician for Teppco Crude Pipeline at the time of his disappearance.

Authorities searched the reservoir, but did not locate any evidence in Shadden's disappearance. Few details are available in his case.