After seven years, the murders of Russell Dermond, 88 and his 87-year-old wife Shirley, remain unsolved. Friends go to check on the couple days after the Dermonds did not show up for a planned Kentucky Derby party. The headless body of Russell Dermond is found in the garage. Police say there is no forced entry to the home, nor is the house ransacked. Shirley Dermond's body is found 5 miles away, murdered and floating in a lake. Her body has been weighted down by cement blocks. Today on Body Bags, forensics expert and professor Joseph Scott Morgan explains what possible evidence may have been left behind.