Article continues below advertisementDid Nancy Guthrie open the door for her kidnapper?While it was initially reported that there were signs of forced entry at the 84-year-old's Tucson, Ariz., home, it remains unclear what exactly happened on the night she went missing.The masked suspect captured on Savannah Guthrie's mom's doorbell camera may have knocked on the front door until she answered, one former FBI agent speculated.Article continues below advertisementSource: megaA masked suspect was captured on Nancy Guthrie's doorbell camera on the night she went missing.