Jack Karch – also known as "Jack of Spades" – is a private investigator in Las Vegas, and an associate of Vincent Grimaldi.
In 1994, he was tipped by Jersey Paltz that Max Freeling had targeted a guest at the Cleopatra Casino and Resort, and arranged a sting operation that resulted in Freeling's death.
In late 1999, he was called in by Grimaldi to investigate the death of Hidalgo, which he discovered was connected to Cassie Black by way of Paltz.