More than two months have passed since Nancy Guthrie, mother of Today co-anchor Savannah Guthrie, was abducted from her Tucson, Ariz., home - and she is still missing. With the Pima County Sheriff's Department already under fire for its handling of the case, a new allegation has emerged that raises serious questions about the investigation. A law enforcement source revealed that one of the lead detectives assigned had never previously worked a homicide investigation.