India, March 30 -- Pima County Sheriff Chris Nanos recently said that the Nancy Guthrie case is "unlike anything we've seen in years in Tucson." He added that a breakthrough could happen any time, but "the real breakthrough" is that "somebody out there knows something, maybe somewhere, somebody's going to say something."

Experts also believe that despite various parallels that can be drawn between the Guthrie case and other missing person cases, many details in Nancy's case are unique, from the victim's age to her celebrity daughter Savannah Guthrie.

The circumstances of Nancy's case are "quite shocking," said Jesse Goliath, a forensic anthropologist at Mississippi State University, according to NPR.

"Usually you hear about smaller chi...