Jeff The Killer will be one of the easter eggs in Five Nights at Treasure Island: Found
Jeff The Killer will be added as easter egg in new update in Abandoned: Discovery Island and has his own creepypasta. There is no gameplay of seeing Jeff, he will be added in new Jeffery's play mingame based on game Abandoned:Discovery Island:Jeff The Killer by Photo Negative Mickey. Jeff's original purpose was to be a mini-game after Night 1 if the player manages to get through the whole night without shutting off a camera.
Jeff The Killer seems to wear a white jacket which is covered in blood, with a black shirt worn underneath. Jeff's face includes his whole mouth missing showing his teeth, which a blood outline stained on the skin around his teeth. Dry blood is also visible on his face, dripping down his eyes. His eyes have a dark outline to them, which his eyes seem to be like a wide open look. Jeff also has long hair.
In Abandoned:Discovery Island:Jeff The Killer Jeff will randomly roam around the place making footstep sounds. Sometimes he will enter Office from the left or right door, player must then hide to get rid of him. If neglected he will kill the player.
Jeff The Killer's original start location is unknown but he possibly starts in Pirate Caverns.