While opening up the attic door, Kyle is attacked and killed. The killer is revealed to be Billy Lenz's sister Agnes, who has set up the corpses of the sorority sisters around a Christmas tree. After Leigh falls through the attic floor, the Christmas tree catches fire while Kelli and Agnes fall into one of the holes in the wall. Managing to escape with Leigh's help, they set the house on fire and reach the hospital. At the hospital, Agnes, who had survived the fire, kills Leigh but Kelli manages to retaliate by using a defibrillator, electrocuting her. When Billy chases her to the stairs, Kelli knocks him over, impaling him on the finial of a Christmas tree and finally killing him. She is last seen staring at Billy's corpse.