for ten years, "dateline" producer dan sleplian has been investigating!he did not commit. the documentary called "conviction" tells the story of jon-adrian velazquez who has been behind bars for 15 years. he was convicted of murder in the death of a retired police officer during a botched robbery in new york city. but he has always maintained his innocence. >> you say you had nothing to do with the crime. you were nowhere close to the scene. why is it that you were picked out? >> that's probably the best question in the world because i don't know the answer. >> we don't know exactly what happened the night of the murder, but "dateline" raises important questions about the case. joining me now is luke russert, nbc's "dateline" correspondent and nbc congressional correspondent. luke, great to have you with us. >> thanks for having me, reverend al. i appreciate it. >> what was it about this case and this story that drew you in? >> i was first approached about this story when i was a rookie reporting just starting out at nbc. and dan sleplian the producer sai