As the search for Nancy Guthrie stretches on to day 19, a retired sergeant speculates the case is taking a major toll on police handling the case. "Well, they're exhausted," Troy Hillman, retired cold case homicide sergeant with Phoenix Police Department, told Us Weekly exclusively. Although Hillman is not part of the ongoing investigation, he gave Us insight as to how officers have likely been coping behind the scenes as they work around the clock in hopes of reuniting 84-year-old Guthrie with her loved ones.