Christopher Plummer Mourned by Chris Evans and More After His Death at 91: 'What an Unbelievable Loss'

Christopher Plummer, Sound of Music Oscar-Winning Actor, Dies at 91

He took home the Oscar for Best Supporting Actor in 2012 for his role in Beginners

Hollywood is mourning one of its brightest stars, Christopher Plummer, after his death was announced on Friday. He was 91.

The beloved Sound of Music actor had a decades-long career with hits like 2001's A Beautiful Mind, 2018's All the Money in the World, 2019's Knives Out and Beginners, for which he won a Best Supporting Actor Oscar in 2012.

Plummer's dear Sound of Music costar Julie Andrews mourned the actor in a statement to PEOPLE shortly after his death.

"The world has lost a consummate actor today and I have lost a cherished friend," she said. "I treasure the memories of our work together and all the humor and fun we shared through the years. My heart and condolences go out to his lovely wife Elaine, and his daughter Amanda."

His Knives Out costar Chris Evans honored the actor, calling his death "truly heartbreaking."

"What an unbelievable loss," Evans tweeted. "Few careers have such longevity and impact."

RELATED: Christopher Plummer, Sound of Music Oscar-Winning Actor, Dies at 91

Christopher Plummer

Helen Mirren, who acted alongside Plummer in 2009's The Last Station, remembered the actor in a statement to PEOPLE.

"I had the great honour to work with Chris Plummer in his Oscar nominated role of Tolstoy," she wrote. "He was a mighty force both as Man and Actor. He was an actor in the 19th century meaning of the word—his commitment to his profession. His art was total, theater being a constant and the most important part of the totality of his drive to engage with storytelling. He was fearless, energetic, courageous, knowledgeable, professional and a monument to what an actor can be. A Great Actor in the truest sense."

Joseph Gordon-Levitt was one of the first celebrities to mourn the actor, simply calling him "one of the greats" in a tweet alongside photos of Plummer playing some of his most famous characters.

RELATED: Christopher Plummer, Sound of Music Oscar-Winning Actor, Dies at 91

In his own tweet, Lost actor Daniel Dae Kim recalled how often he watched Plummer in Sound of Music as a kid.

"One of the many reasons to love #ChristopherPlummer. We watched the #SoundOfMusic so much when I was a boy that he and the Von Trapps felt like family. Rest In Peace, legend," Kim wrote.

Star Trek star George Takei also eulogized Plummer, tweeting, "The Sound of Music is a sad one today as Christopher Plummer has left us today. He was giant of stage and screen, winner of an Academy Award for "Beginners." He died at age 91 with his wife of 53 years, Elaine Taylor, by his side. Rest in eternal music, Captain Von Trapp."

Plummer's longtime manager and friend Lou Pitt released a statement announcing his death.

"Chris was an extraordinary man who deeply loved and respected his profession with great old fashion manners, self deprecating humor and the music of words," Pitts said in a statement to Variety. "He was a National Treasure who deeply relished his Canadian roots. Through his art and humanity, he touched all of our hearts and his legendary life will endure for all generations to come. He will forever be with us."

Plummer was married three times, the first to actress Tammy Grimes, the second to journalist Patricia Audrey Lewis..

He is survived by his daughter from his first marriage, Pulp Fiction actress Amanda Plummer, and his wife, actress-dancer Elaine Taylor.