The ????? ????????death of acclaimed actor Chadwick Boseman stunned the world on Friday. A statement via Boseman's official Twitter account confirmed the 43-year-old star died after a four year struggle with colon cancer.

Over the years, Boseman took on the roles of a number of iconic figures like Jackie Robinson in 42,Thurgood Marshall in Marshall, andJames Brown inGet On Up. In 2016, he joined the Marvel Cinematic Universe when Captain America: Civil Warintroduced the world to King T'Challa of Wakanda. Then, in 2018, he led Black Panther to box office history. 

Celebrities, close friends, and members of the Marvel Universe took to Twitter to pay tribute and grieve the loss of a true hero — both onscreen and off.

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Michael B. Jordan posted a tribute on Instagram on Monday, repeating the words, "I wish we had more time." Here's some of his statement:

Everything you’ve given the world … the legends and heroes that you’ve shown us we are … will live on forever. But the thing that hurts the most is that I now understand how much of a legend and hero YOU are. Through it all, you never lost sight of what you loved most. You cared about your family, your friends, your craft, your spirit. You cared about the kids, the community, our culture and humanity. You cared about me. You are my big brother, but I never fully got a chance to tell you, or to truly give you your flowers while you were here.

I wish we had more time.

I'm more aware now than ever that time is short with people we love and admire. I’m gonna miss your honesty, your generosity, your sense of humor, and incredible gifts. I’ll miss the gift of sharing space with you in scenes. I’m dedicating the rest of my days to live the way you did. With grace, courage, and no regrets. “Is this your king!?” Yes . he . is!  Rest In Power Brother.

And Boseman's Black Pantherco-star Letitia Wright, who played T'Challa's sister Shuri, shared a spoken-word tribute on Instagram on Tuesday. Here's an excerpt of what she said in the IGTV post:

I didn't know this is what I was waking up to, my brother, an angel on earth, departed.

A soul so beautiful, when you walked into a room, there was calm. You always moved with grace and ease. Every time I saw you, the world would be a better place. Words can't describe how I feel, how we all feel, that losing you was forced upon us, to accept this as a new reality. I wish I got to say goodbye.

I messaged you a couple times, but I thought you were just busy. I didn't know you were dealing with so much. But against all the odds, you remained focused on fulfilling your purpose with the time handed to you.

And I'll never forget the day that I met you, before I got on the plane to L.A. for my first meeting with you. God told me that you were my brother and that I am to love you as such, and I always did, and I always will.  

But now, my heart is broken. Searching for old message of exchange, cards filled with your handwriting and memories of you holding my hand, as if it was for eternity.

I thought we had more time and many more years to come, for more laughter and for more moments of me picking on you on set. Leaning my head on your shoulders in the front room, as Ryan gave us notes.

I thought this would be forever. This hurts.