A past character from the Marvel Cinematic Universe will be returning in Avengers 4, as reported by THR

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Frank Grillo has confirmed that his character, Brock Rumlow – also known as the Hydra agent and terrorist Crossbones – will be returning in the fourth installment of the Avengers team-films.He won't be returning in a typical way though, as Crossbones dies in Captain America: Civil War.Grillo said his character will be appearing in a flashback."He makes an appearance in the next Avengers movie," Grillo said during the UFC Unfiltered podcast . "But it's a flashback … I'm allowed to say whatever I want because I'm never doing another Marvel movie." (THR reported that Grillo said the reason is due to his age, not his character's death.)With fans speculating on how the timeline will unfold in Avengers 4 after Thanos' infamous snap in Avengers: Infinity War, this could give some insight on the route Marvel decided to take.Leaked photos from an Avengers 4 shoot appeared online earlier this year and showed Chris Evans in an older version of his Captain America costume, which had fans curious if there would be a flashback sequence to older times with the superheroes or if time travel would be involved in Avenger 4.While we wait for more news on Avengers 4, read up on Thanos' snap affecting himself in Infinity War , the Russo brothers' process on how they decided to portray the ending of the film , and how Captain Marvel will fit into the MCU ahead of Avengers 4's release on May 3, 2019.Let us know in the comments how you think the timeline for Avengers 4 is going to unfold!

Jessie Wade is a news writer for IGN and is a serious MCU nerd. Follow her on Twitter @jessieannwade