they found the actual perpetrator. to those four guys, i'm the guilty project. >> so now the coincidence you just couldn't make up. the very week carol left a phone message for dr. hempikian looking for help, the i'd i innocence project had just taken on a new case, the case of the man convicted of killing carol's daughter, christopher tapp. the doctor called carol back. >> her words to me, i'll never forget, were i just want to know what happened to my daughter. it still brings the hair up on the back of my neck. >> the curiosity of her surprise you? >> the knowledge surprised me. she's turned all of that love and devotion for her daughter into a very careful record of this case. >> so she read that report to him, the one that said the pubic hairs found on angie were similar to or the same as the victim. >> he goes, well, they're either