police sniffer dogs tracked the killer's trail right to his front door. several eyewitnesses chose his picture from a photo lineup and it appeared he committed suicide just as police were about to arrest him. after fisher's suicide, scientists took a dna sample in the morgue and compared fisher's dna profile to the biological evidence from kathy loreck's rape test kit. shockingly, it didn't match. >> we strongly believed that mark fisher was responsible for kathy's death. all of a sudden, he's not. what that means to us is we have an individual still out, walking about, who can do this again. >> it basically meant we had to start at ground zero and do this over again. >> with a killer still on the loose, investigators instituted a dna dragnet of all the homeless men in the area who had a violent criminal history.