Part 1: Four young women attacked, only one survivor. “48 Hours”‘ Maureen Maher has been on the trail of serial killer Michael Gargiulo for more than a decade. How “48 Hours” helped crack one of the cases.

Part 1: Four young women attacked, only one survivor. “48 Hours”‘ Maureen Maher has been on the trail of serial killer Michael Gargiulo for more than a decade. How “48 Hours” helped crack one of the cases.