ernie scherer iii, a person of interest in the particularly violent murder of his parents, quite suddenlyan fed up with negative attention from the cops? but detectives back in alameda county, california did not panic. ernie probably didn't know it but an enterprising officer fitted his car, his deceased father's car, with a gps tracking device. >> for the majority of the time we knew where he was. >> and the car plus ernie's regular visits to social media dating sites led the police to a number of young women he, well, met. like the one in new orleans who called the police after a strange night with a man who first told her he was writing a novel about a gambler who is a suspect in his parents'murder. and who then told her his own parents had been and when she went back to his hotel room, he'd rigged it with bungee cords so if someone came to get him he had a plan to escape. >> he was going to break the window of the hotel room and he was going to basically rappel out the hotel room window. >> so did she quite understandably high-tail it out of there? >> no. she chose to stay. >> stayed