Dateline: Secrets Uncovered (2017)

S09E17 Unraveled

For four long, torturous days, a sense of dread hung heavy over the city, which was now under attack. Six victims had fallen to the gunfire, but the connection between the murders remained a mystery. It took a retired detective to piece together the clues, sparking a search for a man driven by vengeance and armed with a weapon.