(NBC) — Friday on ‘Dateline’, the unsolved murder of a bartender — that took decades to unravel.

“When you look at a crime scene like this — you can tell if there’s a lot of anger — a lot of anger inside somebody to do something like that,” said investigator C.J. Ryan.

Keith Morrison follows the investigation that was reignited decades later when a witness revealed an image seared deep in her memory when she was just 9 years old.

Watch “Dateline: The Black Candle Confession,” on NBC4 at 9 p.m. right after “Lincoln Rhyme: Hunt for the Bone Collector.”