Clown (Joker)

"Thomas Wayne! You get what you've deserve!"

- Clown to Thomas Wayne before murdering him.

The Clown is a minor yet significant antagonist of the 2019 psychological thriller film Joker, a DC Comics stand-alone film based on the character of the same name, which is the first installment of the newly launched DC Black film series, which is entirely separate from the DC Extended Universe. He is an unnamed crook that becomes responsible for murdering Thomas Wayne and Martha Wayne because of their injustice to Gotham at the film's ending.

Biography
Nothing is known about the mugger other than that on the night of the riots, he saw Thomas Wayne, along with his wife and son walking to an empty alley. He managed to block them in the exit and proceed to kill both Thomas Wayne and Martha Wayne. Leaving Bruce as a orphan. It is unknown why he killed Thomas; however, given what he said before shooting him, he could be someone who used to work for him at some point.

Trivia

 * Unlike Joe Chill, the Waynes' killer in the mainstream comic book continuity, the Clown kills Bruce Wayne's parents because of their lying while Chill killed them because he wanted to rob them.
 * Given his role as the Waynes' killer, the Clown is speculated by some fans to be a disguised Joe Chill, but there are no sources that prove that.