DNA proved vital in solving this 23-year-old cold case. Using groundbreaking forensic genealogy, Montgomery County Detectives Alyson Dupouy and Tara Augustine traced the DNA beneath Leslie Preer’s fingernails, revealing a connection that stunned her community. Watch 'First Comes Love, Then Comes Murder' full episode encore - TONIGHT (7/24) at 9/8c on ABC. Stream on Disney+ and Hulu (S47, E 34). #TrueCrime #Investigation #DNA #Solved