where the merrimons lived. >> when did you clean up blood? >> when up in the morning. >> even more important, she implicated her own mother. >> was your mother already in the process of cleaning the blood when you woke up? >> yes. >> amber tells them her mother was with her cleaning up the blood on the stairs. investigators used larry's last meeting with justin merrimon to get the message across. yourhe sister are in trouble. >> you can't break. my mom's involved in this. >> this cold case, this forgotten murder looks like it's solved. time to move. justin merrimon is charged with the rape and murder of katrina montgomery. >> it was a done deal. i mean, the whole murder case. >> not so fast. all that compelling evidence is just talk from informants. witnesses, criminals who want to make deals. their evidence in court will only be as good as their