to many people who watched it play out. almost eight years ago, you might remember two killers invaded the pettitte family home in connecticut. what they did shocked the entire country. when it was over a mother two daughters had been tortured raped and murdered. the house was torched. the father though badly injured managed to escape. he will never be the same. the two murderers were eventually caught convicted and sentenced to death. david produced an hbo documentary on the case called the cheshire murders. he joins us now. there are a lot of eery similarities in these cases. sort of the family setup, the fact that people invaded the home. and actually spent a lot of time there. >> yeah i mean, it even goes further than that. because both crimes really had a financial motive. you know, the cheshire murders, they held the parents, held the mom until the morning. took her to the bank in order to withdraw $35,000.