Tom Hanks is "terribly saddened" by the death of Michael Clarke Duncan.

Tom's The Green Mile (1999) co-star passed away suddenly in a Los Angeles hospital at the age of 54, on Monday, September 3.

Tom was one of the many stars who rushed to pay tribute to the actor.

He said: "I am terribly saddened at the loss of Big Mike. He was the treasure we all discovered on the set of The Green Mile. He was magic. He was a big love of a man and his passing leaves us stunned."

Michael's death comes just two months after he suffered a heart attack, and many of his fellow celebrities have taken to Twitter to praise him and mourn his passing.

Rosario Dawson wrote: "Oh no! Michael Clark Duncan was such a lovely sweetheart! Too young!"

Octavia Spencer added: "RIP Michael Clarke Duncan!"

Olivia Munn shared her personal memories of the actor, writing: "Michael Clarke Duncan always had a smile on his face & a big bear hug ready for you. My thoughts & prayers are with his family&friends. RIP."

Michael—who had worked as a bodyguard for celebrities, including Will Smith, Martin Lawrence, Jamie Foxx, LL Cool J, and Notorious B.I.G before finding fame—recently starred in the Bones spin-off TV show, The Finder.

His Bones co-star David Boreanaz also took to Twitter to remember his friend.

David wrote: "R.I.P. my friend MCD. I will miss you."

Former American Idol winner Jordin Sparks praised Michael for his kindness, writing: "RIP Michael Clarke Duncan. Thank you for being so kind to me & for sharing your talent with the world. You will be truly missed."

Meanwhile, Sherri Shepherd reached out to the actor's fiancee Omarosa Manigault.

She wrote: "My heart and prayers go out to you @Omarosa ... I remember you telling me how happy you & Michael Clarke Duncan were - so sorry."