Possessed

A young man finds that his girlfriend Larissa Welsh has been attacked in her apartment with evidence that points to her buried past. Detectives Benson and Stabler go in search of her attacker and discover that an elderly man, Orville Underwood, may have been involved in traumatic events of Welsh’s past. For the detectives, solving the case comes down to who was in possession of the evidence.

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S12E13 - Mask