what most convinces you that chuck and ryan ferguson killed kent, is chuck saying we did this? >>yes. >> you nervous? >>> shawn nah, the janitor who helped police create the sketch said she couldn't identify either man. but prosecutor crane had a trump card. trump, a convicted sex offender was the janitor who told police he couldn't describe the men he saw at the crime scene. and yet at ryan's trial. >> if you see the individual, would you point to that individual please? >>yes. >>> trump claimed his memory had been jogged be i the arrest photos in the newspaper. >> i recognize the two pictures. i've seen these two faces before at the tribune that night that kent was killed. against him, ryan was doomed. >> all rise, please. >> he was found guilty and sentenced to 40 years. still ferguson is convinced his that chuck is too. >> the police do a great job of talking somebody into a crime they did not commit. >> he believes they were strong false >>> i started going to the crime scene within a week from the arrest. >>> bill ferguson was determined after ryan was sent to prison in december of 2005. >> i'd go down a