Joker faked Jason's death by sending a tape to Batman in which Robin was apparently shot and killed. He eventually escaped and began plotting his revenge on Batman for not saving and replacing him, taking on the name of the Arkham Knight.
He knew Jason was killing people, and Batman couldn't live with the shame of knowing that he had unintentionally created a deadlier version of Joe Chill. This explains the tragedy of what kept Batman away but also highlights his own selfishness and irresponsibility.
How old was Jason Todd when he died in Arkham Knight?
According to the Arkham Knight—Genesis tie-in comic, Jason is 15 when he meets Bruce. When he's trapped by the Joker before the events of Arkham Asylum, Jason is still a minor, not yet 18. His age is probably about 20-22 during the events of Arkham Knight.
Traumatized, Batman takes Jason and Sheila's remains to Gotham and holds a burial with Alfred Pennyworth, Commissioner James Gordon, and Barbara Gordon. Batman blames himself for Jason's death and resolves to carry on alone, rejecting Alfred's suggestion to involve Dick Grayson, the first Robin.
Blaming himself for Jason's death, a guilt-ridden Batman resolved to carry on alone. He even turned down Alfred's suggestion to involve Dick Grayson, his original partner.
While he had finally forgiven Batman and dedicated his life to once again protect the innocent in Gotham City, Jason's continued willingness to kill criminals would forever be a delicate aspect in his otherwise repaired relationship with his mentor.
Rather than being killed at the hands of The Joker, Batman: Arkham Knight shows the killer clown fake the second Robin's death while slowly torturing him within the halls of Arkham Asylum. This trauma leads to Jason's transformation into the Arkham Knight, a cold-blooded killer with the singular goal of killing Batman.
In the Arkham Knight Genesis Comic, Jason's body armor was what protected him from the bullet shot by Joker. Jason was incapacitated and the bleeding came from flesh wounds from the buckshot. The Joker did fake his death when he sent that video to Batman.
Jason was trained by Bruce, and was his ward and partner until his death at the hands of the Joker. He was resurrected by Talia al Ghul using the Lazarus Pit, and then trained by both the League of Assassins and the All-Caste.
What happened to Scarecrow after Batman: Arkham Knight?
Scarecrow fully resurfaced within Gotham nine months after Joker's death and Arkham City's shut down. Severely injured after his encounter with Croc in the sewers at Arkham Asylum, Crane surgically grafted his mask to the remains of his face, fully embracing "Scarecrow" as his one and only identity.
In Batman: Arkham Knight, the Joker lets Jason Todd live, but brainwashes him into believing that he was abandoned by Batman, convincing him to reveal Batman's secret identity as Bruce Wayne before letting him go.
Instead, Jason was kidnapped and beaten to death with a crowbar. Despite Batman's efforts, he's seconds too late to get to the scene, Jason being killed in an explosion of the warehouse following his torture by the Joker. Batman held Jason's dying body, watching his life slowly fade away.
Jason has long resented Batman for refusing to kill the Joker, believing he chose the villain's life over his. However, the pair's relationship has somewhat repaired over time, as Red Hood even adopted his former mentor's no-kill rule while rejoining the Bat-Family.
Jason's death and the events around it were so traumatic that Nightwing, when he was infected with fear toxin, one of the central themes of his nightmare was Jason's death as shown in Nightwing #10. Thankfully after Jason's revival, he and Nightwing have gotten the chance to foster an actual brotherly friendship.
Jason remained dead for six months, his legacy haunting Batman. However, when the evil-alternate reality Superman known as Superboy-Prime punched reality itself, the timeline stuttered, and Jason was restored to life. Jason broke out of his coffin, but collapsed from exhaustion in the cemetery.
For 1988's Batman: A Death in the Family story-line, DC Comics held a telephone poll to determine whether or not the character would die at the hands of the Joker, Batman's arch-nemesis. The character was killed off by a vote of 5343–5271.
What did Batman do to the Joker when he killed Jason?
Presumably after that, Batman managed to lock Joker up at Arkham Asylum, presumably increased security to such an extent that Joker could not hope to escape, and possibly put him into a body cast for six months.
Superman is absolutely heartbroken after Boy Thunder is lost in time, but the Man of Steel doesn't try and kill the Key or even Joker, who both have a hand in what happens. Superman's words to Batman weren't detached moralizing, but deeply personal advice.
DC's Batman and Superman have one of the greatest friendships in comic book history, their friendship is so great that it's even mirrored in that of their sons, but that doesn't mean they don't get into arguments and one of their biggest was over the time Superman stopped Batman from killing Joker, and how they made ...
