An Easter egg in Batman v Superman: Dawn of Justice implied that Robin was already dead in the DC Extended Universe. Thanks to director Zack Snyder, we now know which Robin met his maker.
Answering fan questions on his Vero, Snyder confirmed that Dick Grayson died prior to the events of Dawn of Justice and that it's his suit that hangs in the Batcave. This clears up earlier comments from Suicide Squad director David Ayer, who gave the impression that Jason Todd was dead.
Snyder also revealed that he had plans to hint at Grayson's death in Justice League. It remains unclear if these hints will feature in Zack Snyder's Justice League when it debuts on HBO Max in March 2021.
Created by writer Bill Finger and artist Bob Kane, Dick Grayson first appeared as Robin in Detective Comics #38 in April 1940. He would eventually outgrow that persona in July 1984 and become Nightwing in Tales of the Teen Titans #44.
Justice League stars Ben Affleck as Batman, Gal Gadot as Wonder Woman, Henry Cavill as Superman, Amy Adams as Lois Lane, Jason Momoa as Aquaman, Ezra Miller as The Flash, Ray Fisher as Cyborg, Jeremy Irons as Alfred Pennyworth, Diane Lane as Martha Kent, Ciarán Hinds as Steppenwolf, Jesse Eisenberg as Lex Luthor and J.K. Simmons as Commissioner Gordon. Zack Snyder's Justice League will premiere exclusively on HBO Max in 2021.
Source: via DCEU Mythic
NOTE: This story was updated Dec. 29 with updated information.