Griffiths' agent said the British actor died Thursday from complications following heart surgery.
Griffiths has appeared in dozens of films and TV shows. He's also known for his onstage performance in Alan Bennett's "The History Boys," as well as in "Equus" with "Harry Potter" star Daniel Radcliffe.
Radcliffe on Friday said he is "proud" to have known Griffith.
The Associated Press contributed to this report.
