3 X Dna X 3

Three murders solved? Six more murders with the same Mo? 700 miles away two more murders? Dna evidence points to one already on death row and two unknowns? When the killers decided to kill Margie and her daughter Mary Lou, they received more than they bargained for. One of the suspects the Sheriff wants to jail; only his Dna does not match any profiles and how is there a Dna match to the man already on death row?