. >> did you ever know augustus brown? >> no, i didn't. >> you had no relationship with him prior? >> absolutely not. >> velazquez's lawyers say finding out why brown picked him out in the first place may be the only way to know if velazquez got justice. >> augustus brown, the 20-year-old heroin dealer, is this case. >> we found augustus brown in state prison where he is serving time for forgery. we were led into a conference room and turned on our hidden camera. >> thanks for meeting with us. we appreciate it. >> he told us about the day of the crime, how he met lorenzo woodford at the club. >> he was a heroin addict. >> brown said he fled right after the shooting, but detectives tracked him down. >> they snatched me up off the street early. >> he set he was in the precinct all day, that police sat him in front of a computer screen and asked him to look at pages of mugshots. a police report backs that up. he was shown 230 pages, eight photos per page. that's more than 1800 photographs. finally, he says he spotted someone.