Saw it on TV ages ago, and it's about a guy who hunts down people who had signed themselves up to donate all their organs - basically suicide. Then one of his marks tells him that he's making a mistake and that she never willingly signed away her life. He kills her anyway. Then later on he finds that he himself has also somehow signed away himself and is now being hunted and must find a way to expose this racket. At the end, he wonders how many others were tricked. Very chilling.