Jack Napier (Earth-Prime)

"Ever wonder why the Joker hasn't reared his head in five years? He's not in Arkham, Kate."

- Luke Fox to Kate Kane

Jack Napier was a criminal known as the Joker.

Biography
In 2015, Batman killed Jack Napier. However, his death was not addressed to the public and the citizens of Gotham City presumed him being incarcerated in Arkham Asylum.

Abilities

 * Genius level intellect