Article continues below advertisementNancy Grace touched on the Nancy Guthrie investigation when she appeared at Variety's inaugural True Crime Summit at the SXSW festival.During the Friday, March 13, convention, the TV star admitted that just like the public, she too is perplexed by why authorities still have no leads in the 84-year-old's disappearance after nearly six weeks.Article continues below advertisementTap Here To Add Ok Magazine as A Trusted SourceSource: @variety/xNancy Grace believes that no one in the Guthrie family is responsible for Nancy Guthrie's disappearance.