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Sean Costley
Sean in 1994
Sean Costley
Portrayed by Josh Reaves
Episode Thrill Kill
Status Deceased (1994)

Sean Costley is a victim in "Thrill Kill" along with his friends, George Russo and Jack Raymes.

Sean and George would bully Jack into doing things, such as playing a prank on his father Henry Raymes by turning off the lights in the basement for their own amusement. However, Henry was afraid of the dark and had a mental breakdown. When Sean and George laughed at him, Henry beat all of the boys to death with a flashlight. Their bodies were dumped in an empty swimming pool with their eyes taped shut. Their bodies were discovered by three people; Dylan Noakes (who was spraying graffiti in the pool), a crazy homeless man named Job (who saw Dylan standing over the bodies) and Detective Joe Connelly. Joe beat a false confession out of Dylan's friend Teddy Nimmo and the two boys got life in prison.

It turned out that Henry had sent Teddy a note in prison, admitting to his crimes. Teddy tried to give it to his lawyer but the man didn't want anything to do with him. Teddy hanged himself in 2007 which led to his mother Myrna Nimmo discovering the note and handing it to the cold case team.

In the epilogue, Henry is arrested and Jack's mom Tanya Raymes visits the empty pool (she knew the whole time that her husband was the killer). Lilly Rush comes by the neighborhood and imagines Jack, George and Sean riding past on their bikes.

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