Evidence analysed by the FBI could help cops finally solve a grisly murder in which a husband was found decapitated and a wife at the bottom of a lake.
Russell Dermond, 88, was found dead in May 2014 by a neighbour who had stopped by their $1 million home in Atlanta, Georgia after not hearing from them for several days.
His decapitated body was found in a garage surrounded by towels, put in place to stop blood from escaping under the door and rousing suspicion, and gun residue on his body.
