the man, they said, was one of the later men convicted in the attack, jeremy sanchez.es. >> was that woman sarah pearce? >> no. >> you sure of that? >> 100%. >> who was it? they wouldn't say her name on camera. but the family made it clear that the young woman was a close family friend, so close she had dated another one of the brothers, so close she called mrs. rivera mom. her name? that original suspect again, erica curiel. >> how can people know that you are absolutely positive it was her? >> i can bet my life on it. >> sometime after the night of the attack, erica bragged about beating the polygraph, passing the lie detecter test, which was at least one factor in her eventual release. >> she was laughing about it. she was. she was laughing about it saying, i beat the system. i beat the system. >> but she made no bones about the fact that she was guilty? >> yes. >> the reason they finally came forward, to honor their late father. >> did you ever feel bad all those years when you were keeping the secret? >> yes. >> every day before he died. that's what he wanted us t