Richard Griffiths, one of Britain's most celebrated character actors, has died from complications following heart surgery.
The stage and screen star, who played Uncle Vernon Dursley in the Harry Potter films, was 65.
Daniel Radcliffe, who played Harry Potter alongside him, led tributes to the actor whose "encouragement, tutelage and humour" made work "a joy".
Radcliffe, who also performed with Griffiths in the stage play Equus, said: "Richard was by my side during two of the most important moments of my career.
"In August 2000, before official production had even begun on Potter, we filmed a shot outside the Dursleys', which was my first ever shot as Harry. I was nervous and he made me feel at ease.