“Obsessiveness is a double-edged sword, right?” Sexton tells Vanity Fair. “The obsessed can achieve remarkable things, and the obsessed can lead to terrible and wrongful outcomes. But there’s little doubt that they meet the definition of obsessed, and that’s not a healthy place to be.”
For nearly two decades, the case has been tied up in the true-crime entertainment machine. CBS’s 48 Hours took it on in 2009 while the case was still cold, an unusual maneuver for a franchise that…

