The Evictors

The Evictors is a 1979 horrorcrime cult film written and directed by Charles B. Pierce.

Near the end, Ben himself tries to stop the lurker from hurting Ruth only to end up being killed by accident when Ruth attempts to shoot the lurker only to shoot her husband. When Ruth decides to move out, she decides to say goodbye to her neighbors only to discover that the lurker resides in the house next door. The lurkerkiller is Dwayne Monroe who lives with Anna, who is actually Olie Monroe. The real estate agent Jake, who sold the house to Ben and Ruth, is actually Todd Monroe who has been running a real estate scam for decades JakeTodd Monroe sells the old Monroe house to unsuspecting young couples, while his sisterinlaw AnnaOlie Monroe befriends the new tenants to learn more about them, and their brother Dwayne Monroe terrorizes, harasses, and eventually murders the new owners, enabling Jake to buy back the house and live off the sale proceeds which he splits with Olie and Dwayne. During a scuffle, Dwayne murders Olie and then goes after Ruth, only for Jake to shoot and kill him in self defense.In the final scene, set five years later in 1947, the nowinsane Ruth has now married Jake and willingly joins him with his continuing scam of selling his old family house to unsuspecting people so both he and Ruth can continue the Monroe legacy of murdering the new owners who move into the Monroe homestead to live off the sale of the property. ........

Source: Wikipedia