Retired FBI profiler Jim Clemente believes the person responsible for Nancy Guthrie's disappearance from her Tucson, Ariz., home nearly 100 days ago "bumbled" his way through the crime and may have left behind enough evidence to eventually be identified, Wonderwall.com can report. Clemente, who spent 22 years with the FBI, pointed to blood evidence found outside the 84-year-old woman's home as a sign she was still alive when she was taken off her property.