TUCSON, Ariz. (KVOA) - A Shadow Hills resident tells News 4 Tucson that she witnessed three people being detained during a SWAT operation on Friday night. According to an unconfirmed report by a neighbor, another person shot himself in the head. This comes after a SWAT situation occurred in the Shadow Hills neighborhood on Feb. 13. A man and a woman were detained at the house, and a third person was detained in a traffic stop, according to sources close to the investigation. The Pima County Sheriff's Department said the SWAT operation was in connection with the Nancy Guthrie investigation....