Matelli and Ryan

Matelli and Ryan were two Gotham police officers who played unwitting roles in the creation of the Joker. Matelli was a plainclothesman detective and Ryan a beat cop. In Dimension J-510 they are the officers tasked with telling Jack Napier -- the man who would become the Joker -- that his wife Jeannie had died when a baby bottle heater shorted out on her. In Dimension J-513, Matelli works with Bruce Wayne and Harvey Dent to help Jeannie escape her increasingly erratic and violent husband. Without her knowledge, they tell Jack that Jeannie has died from the electrical short that really did kill her in Dimension J-510. In both timelines, it is Jeannie's death that helps drive Jack insane, turning him into Gotham City's Clown Prince of Crime.