Article continues below advertisementSavannah Guthrie's 84-year-old mother, Nancy Guthrie, has now been missing for over 48 hours.A Tucson, Ariz., resident, she was last seen at her desert home on Saturday night, January 31, at around 9:30 p.m., with her disappearance being reported on Sunday after she failed to show up for church services. During a Monday, February 2, press conference, Pima County Sheriff Chris Nanos said they discovered "concerning" evidence at the residence, leading them to believe a "crime" took place. The evidence has since been revealed as blood.