the interrogation over, krebs brings investigatoring to the crime scene, keeping his promise to larry hobsone liked larry. it's a weird relationship, but it's a relationship. >> despite that relationship, hobson testifies at cribs' 2001 trial, persuading the jury to send the killer to death row for raping and killing the students. >>> from san quentin, krebs writing christmas cards to hobson, grateful for the way the investigator questioned him, with decency and kindness. >> it just shows that he respected me for the job i had to do. it's just business. >>> coming up -- what's it like to be 12 years old and sitting in the interrogation chair? >> i didn't do it. i didn't kill my sister. i wouldn't kill her. try bayer advanced aspirin. it's not the bayer aspirin you know. it's different. first, it's been re-engineered with micro-particles. second, it enters the bloodstream fast, and rushes relief to the site of your tough pain. the best part? it's proven to relieve pain twice as fast as before. bayer advanced aspirin. test how fast it works for you. love it, or get your money back. challenge t