We still don’t know for sure who will be playing Sharon Carter in “Captain America: The Winter Soldier”, but the latest Marvel flick does have another villain now locked down. After a week of rumor and speculation, Variety confirms “End of Watch” actor Frank Grillo has closed his deal to play Brock Rumlow, who would ultimately adopt the villainous moniker Crossbones, opposite Chris Evans returning as supersoldier/Avenger Steve Rogers.

Grillo teased fans last week when he tweeted about meeting with Marvel and hoping a deal could be worked out, along with the hashtags #CaptainAmerica and #bones. Well, work out it did, and Grillo becomes the latest to join the cast that already includes Sebastian Stan returning as Bucky Barnes, who becomes the titular Winter Soldier, Scarlett Johansson as the Black Widow, Cobie Smulders as Maria Hill, as well as fellow newbie Anthony Mackie, who takes on the role of the Falcon. And of course, whoever lands the role of Sharon Carter, be it Mary Elizabeth Winstead, Jessica Brown Findlay or any of the other dozen names mentioned in relation to that particular casting. Anthony and Joseph Russo will direct “Captain America: The Winter Soldier” next March, with a release already set for April 4, 2014.

Grillo has been acting steadily on TV and in movies for years, but is undeniably having a bit of a moment on the big screen right now, thanks to a string of impressive supporting turns, first opposite Joel Edgerton in “Warrior”, then Liam Neeson in “The Grey” and most recently opposite Jake Gyllenhaal and Michael Pena in “End of Watch.” He’ll surely impress further when he reteams with Edgerton in Kathryn Bigelow’s “Zero Dark Thirty” and with Mackie in “Gangster Squad.”