Motives & Murders: Cracking the Case

A Sister's Promise (7x6)

Air date: May 30, 2017

The mutilated body of 17-year-old Lori Billingsley is found in a ditch on the outskirts of town, pointing to a sadistic killer on the loose in Oregon, but Billingsley's case goes cold, and it's up to her sister to pursue justice.