facing a possible death sentence, jonathan graham pled guilty to first-degree murder and rape. >> i don'tber much of the incident, other than i pushed him against one of the walls. >> graham had no way of knowing that 20 years later, technology would eventually catch up with him. >> the forensic science behind this investigation is what sealed jonathan graham's guilt, even without ever stepping a foot in court. >> over my career, i've seen some amazing things, and that, coupled with good detective work, there's just no end to what we can do. >> we here in science, in forensics, we're here for the truth. we're not here for the prosecution, we're not here for the defense. we're here for the truth. >> he will spend the rest of his life in a state penitentiary. >> after 15 minutes in the fuming chamber, one partial palm >>> the forensic evidence from virginia russell's murder pointed to justin bullard. the gun, the bloody shoes, the >> the son says he's telling the truth but refuses to take a polygraph. >> what does he have to hide? >> we have proof. >> can forensic science provide the answer