Similarity between copycat and stir of echoes. (Spoilers)

In my opinion, it's the ending on both movies.

In copycat, even though they killed the Serial Killer, just like what Connick Jr. said that he has a lot of disciples and that it won't stop from haunting Sigourney or Holly, and in the last few seconds before the credits roll, he sent a message to a guy named Conrad to do some serial killing again.

In Stir of echoes ending, even though Kevin and his family solved the problem about the ghost girl and moved to a different house, it won't stop and lots of ghost would seek more help to solve their problems because of their son Jake, who has a bigger "flashlight" and has the ability to communicate with the ghosts.