Randy Parker is a police officer that was the 4th and final person to be possessed by Jason Voorhees. Randy is almost always shown with Sheriff Ed Landis. Randy is usually also shown with Steven Freeman.
Randy then appears again when Jessica Kimble is struggling with Landis. Randy orders Landis to back off, but Jessica accidentally stabs Landis in the chest.
Randy is then revealed to be Jason and tries to possess Stephanie, but Steven barges in and slashes his neck with a machete, nearly severing his head.
Randy's corpse is then abandoned by Jason, who crawls out of his neck.