The Lawrence of Arabia star passed away on Saturday (14Dec13) in London, following a long illness.
After the news of his death broke on Sunday (15Dec13), a number of famous faces took to Twitter.com to pay their respects to the iconic star.
Howard writes, "Rip Peter O'Toole. One of his generation's greatest talents", while actor Neil Patrick Harris, who worked with the Irish veteran in 1999 on Tv movie Joan of Arc, tweets, "So sad to hear about Peter O'Toole passing away. Lucky to have worked with him for a month in Prague. Wonderful man, remarkable talent."
Actress Marlee Matlin writes, "Sad to read about passing of acting great Peter O'Toole. Eight Oscar nominations highlight what a talent he was. Rip" and Ben Stiller posts, "From Lawrence of Arabia to My Favorite Year… and so many others. One of the movie greats is gone. Respect to Peter O'Toole."
Whoopi Goldberg, Alec Baldwin, Tony Bennett, Simon Pegg and La Toya Jackson have also added tributes on Twitter.