India, March 14 -- The investigation into the disappearance of Nancy Guthrie, the 84-year-old mother of Savannah Guthrie continues to puzzle investigators and crime experts. Speaking at Variety True Crime Summit during the SXSW festival in Austin, a legal commentator Nancy Grace said she is just as confused about the case as many others following it.

Nancy Grace spoke about the investigation during a conversation with Dea Lawrence. The disappearance of Nancy Guthrie has been widely reported since authorities said she was kidnapped from her home in Tucson, Arizona on February 1.

"I've been asking that question since about Day 2 of Nancy Guthrie's disappearance," Grace said while discussing why the case remains unsolved despite modern for...