http://www.dccomics.com/blog/2015/07/10/batman-the-killing-joke-gets-an-animated-adaptation

Warner Bros. revealed the three DC Universe Original Movies that will be released in 2016, including an adaptation of the classic Joker story, Batman: The Killing Joke.

Batman: The Killing Joke is the seminal graphic novel written by Alan Moore and drawn by Brian Bolland that offers up a potential (but not exactly trustworthy) origin for the Joker, and that led to a paralyzed Barbara Gordon to retire as Batgirl…temporarily. For years, it’s been one of the most regularly requested animated films by fans.

The animated adaptation of Batman: The Killing Joke is executive produced by Bruce Timm and will retell this classic tale in an exciting new way. It’ll also feature an original 15-minute prologue that helps set up the story, giving even longtime fans of the story something new to look forward to.