Dennis Racket was the very first sim killed by Jim Pickens. He was the first sim known by Jim and became his Nemesis instantly.
Dennis Racket is a recurring character in Kevin's Sims 3 and 4 let's plays. He is well known for coming back to life after being killed by Jim, even though Jim keeps all of his graves to prove that he killed him.
The very first time Dennis Racket was killed was in: "The Sims 3 - Lets Play Ep 14 - The Perfekt Crime" where he was stabbed by Jim in the restroom of a museum.
After many deaths later, Dennis finally dies in a matter that didn't involve Jim.