Susan Cox Powell disappeared from her West Valley City, Utah, home on Dec. 6, 2009. Her husband, Josh Powell, who had been considered a “person of interest” in her disappearance, later moved to Washington state with the couple’s two children. He killed himself and the couple’s two children in an explosion and house fire in Graham, Wash., in February 2012. Josh’s father, Steven Powell, of Puyallup, Wash., was convicted in 2012 of voyeurism and sentenced to two and a half years in prison. He has cited his Fifth Amendment rights on refusing to discuss Susan’s case.