prosecutors believed carmen smith had been murdered at the hands of wassim decker, her neighbors stalkeral evidence tying wassim to the crime they could improve it and investigation stalled. years past, but determined detective was about to take a new look at an old clue and turn this case from cold to red hot. once again here is the killing in cobb county. after 10 years in prison wassim decker was a free man. but still a suspect in the murder of carmen smith and the stabbing of her son, nick. >> he was still terrorizing you in some ways. >> just the fact that he was out was kind of terrorizing. >> he is that character in those horror movies. he's like your worst nightmare. >> after his release decker got a job and moved to suburban atlanta. he was a free man and enjoying life. here he is skydiving and loving it. decker's freedom called homicide detective jon doss. the carmen smith murder was now officially a cold case. to dos decker was the one who got away. does a case like this hunt a police department? >> absolutely. because these cases go home with you. in your mind. >> four years