valerie newman. >> when i got to hearing, it was all-out warfare. >> you may call your first witness.: the defense began laying out the strange tale from the start with mary evans and her 2009 facebook post. >> miss evans, why have you come forward in this case? >> on the streets, i always heard that highers didn't do it. >> next the d.c. lawyer who just happened to answer that post of mary's. >> would you please state your name for the record. >> kevin zieleniewski. >> reporter: on the stand kevin retold the story that john, the old roommate told him way back in 1993. >> he made a comment, you wouldn't believe what happened that night. >> reporter: so said kevin, he felt a duty to step in. >> why are you here today? >> two innocent people are in prison for life. i learned information that could help set them free. and i felt compelled to bring that information forward. >> reporter: then one by one, the witnesses. the now 40-somethings who told the court about that night outside old man bob's house where they had gone to buy marijuana for their graduation party and that it was their f