no surprise to lawrence friends. >> i never thought it was david, i never thought it was joe. >> the eventually cleared the maintenance man as well. august 2, five weeks after lauren disappeared, stephen mcdaniel, the quiet law student graduate was charged with murder. he maintained his innocence, pled not guilty. stephen seemed harmless. note criminal record, the evidence against him was circumstantial. the da was not confident. >> i was worried unless we had more that this would be a case where everybody knew he did it but nobody could prove it. >> time to take a harder look at the evidence. >> coming up, investigators are about to discover a certain piece of deleted video. >> i knew we had him.