Christopher Plummer, the legendary actor who played Capt. Georg von Trapp in 'The Sound of Music', Mike Wallace in 'The Insider', and countless other roles, died yesterday at the age of 91.

Plummer first began his acting career at the age of 18 in his native Canada, where he became a successful stage actor and was a contemporary of William Shatner, who he would later star opposite in 'Star Trek VI: The Undiscovered Country' as General Chang of the Klingon Empire. Throughout the '50s and early '60s, Plummer became a celebrated actor and moved to the US where he began securing roles in Broadway and on television.

The role Christopher Plummer is perhaps best known for is playing the father of the von Trapp children in 1965's 'The Sound of Music'. Plummer went on to famously describe the movie as 'The Sound of Mucus' and jokingly described working with Julie Andrews as being beaten over the head with Valentine's Day card. Despite his own issues with the movie, it became one of the highest-grossing movies ever made and is a beloved family classic to this day.

More recently, Plummer starred in 2019's 'Knives Out' as the murder victim Harlan Thrombey, J. Paul Getty in Ridley Scott's 'All The Money In The World', and had a voice role in the game 'Elder Scrolls V: Skyrim' as Arngeir, the Greybeard who mentors the player.

All told, Christopher Plummer won a total of 25 awards for his work throughout his career, including an Oscar for Best Supporting Actor at the age of 80 - the oldest ever to win an acting award at the Oscars - for 'Beginners', two Emmys, two Tonys, a BAFTA, a Golden Globe, and a SAG Award.

Here's what some of his fellow actors and contemporaries had to say on social media.