Tainted (August 8, 2017)

Tim Drake's costumed career was tainted, however. Some years later, after Dick Grayson had left Gotham for Bludhaven, Drake was patrolling as Robin alone, one night. He saved a woman from two thugs, but the supposed mugging was actually a trap set by the Joker. Robin was taken to the ruins of the first Arkham Asylum and tortured for three weeks. After being systematically subjected to shock therapy and various serums, he eventually broke down. Drake dispensed entrusted secrets to the Joker. As part of his final joke, Joker molded Drake into a crude version of himself and planned on having Drake deliver the killing blow to Batman. However, Joker didn't completely succeed. In the final minutes, Drake broke through the brainwashing and killed the Joker instead of Batman before suffering a mental breakdown and Batgirl comforts him. Batman and Batgirl then buried the Joker deep beneath Arkham and the only person who knew the incident was Commissioner Gordon, who promises to keep it a secret. The other people who also knew the incident were Alfred Pennyworth and Dick Grayson. Dr. Leslie Thompkins was entrusted to rehabilitate Drake. After a year, he was cleared. However, Batman felt responsible for what happened and forbade Drake from ever being Robin and swore that he will never endanger another young partner again. Drake went on his own (maybe even serving full time on a super hero group of his own) and attempted several times to mend his relationship with Batman but it never fared well. Tim left after this.