Savannah Guthrie pleads for tips as ransom note claims mom is dead: 'Somebody knows something'

Fox News reports a massive search for Nancy Guthrie, Savannah Guthrie's mother, in Mexico following an anonymous tip about a shallow grave near the Nogales border. Christina Coleman details how the location was checked, but Nancy Guthrie was not found. The Pima County Sheriff's Department states the investigation remains active.

Savannah Guthrie pleaded with viewers Tuesday to come forward with any new information, following reports that one of the ransom notes sent to her family declared her mother dead.

"I just want to take the opportunity to ask people, to really to beg people to come forward. Somebody knows something. This is a new story today that is on your radar but this is the life that my sister lives, I live, my brother lives, our extended families live, our children live every day. We are in agony," Savannah Guthrie said Tuesday.

Sunday marked 20 weeks since Nancy Guthrie was abducted from her home in the Catalina Foothills north of Tucson.

Nancy Guthrie, the mother of "Today" co-host Savannah Guthrie, remains missing and the family is urging renewed attention as the search drags on. (Courtesy of NBC)