Snapped: Killer Couples (2013)

S14E4 Teresa Lewis & Matthew Shallenberger

After a brutal home invasion takes the lives of a father and his grown son, the investigation into their deaths uncovers a shocking web of secret love affairs and deep-seated family treachery that leaves everyone reeling. As detectives delve into the case, unexpected revelations about relationships and loyalties emerge, revealing that not everything is as it seems within the family circle.