It was an early spring morning in March 2008 when Charlotte police made a gruesome discovery: Four people shot dead in a top-floor apartment. The bodies were "riddled with bullets," yet nobody reported hearing gunshots.
It's a story that seems straight out of a CSI episode: A cold case involving a string of rapes and murders. A crime-scene DNA sample that sat in a freezer for decades. A forensic criminologist who thought outside the box to dig deeper. And a new technology that led him right to the suspect's doorstep.