cahill: john was actually rather well-liked by his neighbors.guy that would be out there when it snowed, plowing their sidewalks. this guy was so nice. and he was trusted. he wanted to make people laugh, and he particularly wanted to help kids. sneed: and he became a clown. and he did a lot of functions for charity that involved him dressing up as the clown. that was the good side of him. ♪ ♪ sullivan: then, the other side of the coin was, "my god, how many disappearances was he involved in?" [ telephone rings ] then one day, they got their answer. after cops searched gacy's house, he calls his lawyer and says he wanted to talk about rob piest. amirante: one day he called me. he said, "it's very, very important i talk to you. i have to tell you something." gacy sits down, and he tells me the same old... about robbie piest, vehemently, unequivocally denied. i took the newspaper with robbie piest's picture. i threw it in front of him, and i said, "look at this kid. john, look at him. he's a good kid. he's missing." he looked at the picture. he sai