>> yes. >> an old girlfriend named carla daniele. correct? >> reporter: a wisp of doubt, cara's separation. and what about carla? remember, she said she'd been miles away at the gym and out running on the day of the murder. security images seemed that support that account, but the defense produced a bank record dated the day of ann's death from an atm closer to the crime scene than the gym. >> did you ever ask her about how that could have happened if she was running in east longmeadow? >> i don't know that -- i've never asked her that. >> reporter: the name of the game for criminal defense lawyers is creating reasonable doubt. had the defense finally gotten there with all 12? >> coming up, the verdict. >> i'm still reeling on that one. >> god, where art thou? >> when "dateline" continues. ns. rodney -- mastermind of discounts like safe driver, paperless. the list goes on. how about a discount for long lists? gold. mara, you save our customers hundreds for switching almost effortlessly. it's a gift. and jamie. -present. -together we are unsto