>> he was polite. he was affable. he was not argumentative. >> psychiatrist fred berlin met and evaluated ross before his trial. he says michael ross is a sexual sadist. >> sexual sadism is like alcoholism, a craving disorder that people are having intense cravings and feeling very tempted to give in to those cravings. >> i used them. i degraded them for my own personal pleasure. had to end. >> but it didn't. after tammy williams and debra taylor, ross continued his silent connecticut killing spree, murdering four more including 19-year-old state javelin champion robin stavinsky and teenage friends april brunais and leslie shelley. the two girls only 14 years old, were thought to have run away. ross apparently spotted the two