Throughout "Aftermath," Natalie and Kevin are tormented in a variety of ways. Though they start out mildly, the events quickly get more and more horrific: their dog Odi is poisoned and has to be put down, illicit magazines are sent to their home in Kevin's name, and Natalie is even attacked at home when Kevin is away one night. Though we learn that some of the unsettling stunts were committed by a disgruntled family member of the deceased original inhabitants of the home, a twist in the story reveals the true culprit is even more creepy.
As it turns out, the original couple who lived in the home — Erin and Jay — were not killed in a murder-suicide. They were, in fact, killed by Erin's secret lover named Otto (Jason Liles), who'd been living within the home the whole time. Since Erin designed the home herself, she included a secret space that allowed her to sneak Otto in and out.
Unfortunately for Erin, when she ultimately chose her husband Jay over her lover, Otto lost control and killed the couple, then continued to live in his secret hideaway and enact his revenge on the new inhabitants of the house.
