i says, this is a murder case. >> this is tapp's mother, vera, she understood what he apparently did not that her son was quite possibly talking himself into very big trouble. >> mom, i don't have anything to hide. i want to tell them that i don't know anything. >> but it didn't quite work out that way. before long, chris tapp had written a statement for police saying that ben hobbs said he killed her and i just laughed it off like he was just telling me a joke. ah, but that was just the beginning. over the next several weeks they had tapp in here 9 times, questioning him 20 hours, even gave him an immunity deal and that is when mr. tapp's story began to evolve. yes, he admitted he was there when ben hobbs killed angie, even held her down, he admitted, when ben stabbed her and then finally, he said, he even stabbed her once himself. the motive, revenge. supposedly angie had been meddling in ben's marriage and mr. hobbs did not like that one bit.