Twenty years ago this weekend, an explosion rocked a quiet southern Scottsdale neighborhood in the morning hours, sparking a house fire that sent flames over 20 feet into the air. As the home burned, no one â neighbors, police or firefighters â knew that the inferno concealed a grizzly crime scene that has remained unsolved for two decades and made Scottsdale resident Robert Fisher a fixture on the FBIâs most wanted list of fugitives to this day. The Fisher home, which was located east of the intersection of Oak Street and Scottsdale Road, caught on fire around 8:30 a.m. on April 10, 2001 following an explosion caused by a cut natural gas line. Investigators later found that an accelerant had also been spread around the home.