Savannah Guthrie pleads for tips on air as ransom note claims mom is dead

Savannah Guthrie made an emotional plea on air Tuesday, begging the public to come forward with any information about her mother's disappearance, saying "somebody knows something." (Credit: NBC)

Savannah Guthrie made an emotional plea on air Tuesday, begging the public to come forward with any information about her mother's disappearance, saying "somebody knows something" and that her family is living in "agony" 20 weeks after Nancy Guthrie was abducted from her Tucson-area home. (Credit: NBC)