>> i'm called the banana and i look really good. >> can you be a little more descriptive? >> peel me. >> reporter: investigators have long pursued him before he appeared on the dating game. he'd been convicted of kidnapping and raping a young girl. he was convicted twice in the killing of robin sanso. twice the case went to retrial before finally this latest conviction for her and four other murders. and over the years, investigators have raised many questions about possible connections between alcala and other murders. but time and again, they have not come up with enough to charge him. >> say hello to rodney alcala. >> reporter: at the end of the game show, he even won the girl. published reports show, however, they never went on that date. and perhaps that's just as well. tom foreman, cnn. well, a couple of hours ago,