The Joker (Cameron Monaghan) has a huge arc with Bruce Wayne (David Mazouz) in "Gotham" Season 3. Fox

Ever since Cameron Monaghan’s Joker was killed off in “Gotham” Season 2, fans have been wondering how he will make his way back into the storyline. After all, the Joker is one of Batman’s most formidable opponents, so it makes no sense for him to bite the dust after just a couple of episodes.

David Mazouz, the actor who plays the young Bruce Wayne in the Fox series, recently hinted that the Joker will make his way back this Season 3. On his Instagram account (@davidamazouz), the actor posted a photo of himself with an interesting graffiti in the background. The graffiti on the wall featured huge, sinister eyes and the word “Hahahahahahaha” was written in the shape of a clown’s smile.

“A #gotham favorite villain may be coming back to @gothamonfox sooner than you think,” he wrote.

Mazouz’s excited fans made tons of comments on the photo. “Please please please be Jerome [Valeska],” a fan wrote, referring to the alter-ego of the Joker who was killed off.

“I will cry for the rest of my life if it isn't Jerome,” another enthusiastic fan echoed.

Executive producer Ken Woodruff earlier told TV Guide that they do have plans to bring the Joker back, so they have been trying to keep the mythology of the villain alive. However, fans have to exercise a bit more patience because the mystery of the Joker will unravel sometime in the middle of Season 3.

“We are absolutely planning in Season 3 - but primarily in the mid to second half of Season 3 - to delve back into the mythology of the Joker, and characters that may or may not be the Joker - but more likely characters that are an amalgamation of what we'll come to know as the Joker,” Woodruff teased.

Another big piece of news is the reveal of Joker’s love interest, Harley Quinn. Woodruff told IGN that they have already introduced the character in the first two seasons, and fans might have just missed her.

“You may have already seen Harley as a person that you thought you had met and known for a long time. So we always reserve the right to sort of do that as well,” he said.

“Gotham” airs every Monday at 8 p.m. ET on Fox.