The reward has doubled as authorities intensify their search for Savannah Guthrie's 84-year-old mom, Nancy Guthrie, 18 days after she was first reported missing. Us Weekly has learned that 88-CRIME received an anonymous $100,000 donation "allowing the program to increase the reward for this case to $102,500," according to an update from Pima County Sheriff's Office on Wednesday, February 18, which noted that dollar amount is in addition to the $100,000 being offered from the FBI.