'Harry Potter' actor Richard Griffiths has died of complications following heart surgery, it has been announced.

He was 65 and known to many as Uncle Monty in 'Withnail & I', whilst he also played Uncle Vernon Dursley in the Harry Potter films.

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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.

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Richard Griffiths as Uncle Monty in 'Withnail & I'

"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.

"Seven years later, we embarked on Equus together. It was my first time doing a play but, terrified as I was, his encouragement, tutelage and humour made it a joy.

"In fact, any room he walked into was made twice as funny and twice as clever just by his presence. I am proud to say I knew him."

And Griffiths' 'Withnail & I' co-star Richard E. Grant tweeted:


Richard E. Grant
My beloved 'Uncle Monty' Richard Griffiths died last night. Chin-Chin my dear friend.

Griffiths died yesterday at the University Hospital of Coventry and Warwickshire.

Read some of his most memorable quotes here.

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  • The Dursleys, Harry Melling as Dudley Dursley, left, Richard Griffiths as Vernon Dursley and Fiona Shaw as Petunia Dursley, in a scene from the film Harry Potter and the Sorcerer's Stone Photo by Warner Bros.

  • (L-r) RICHARD GRIFFITHS as Uncle Vernon, HARRY MELLING as Dudley Dursley and FIONA SHAW as Aunt Petunia in Warner Bros. Pictures' fantasy "Harry Potter and the Order of the Phoenix."

  • "Equus" Press Photocall - February 22, 2007

    Richard Griffiths and Daniel Radcliffe at the Gielgud Theatre in London, United Kingdom. (Photo by Eamonn McCormack/WireImage)

  • Daniel Radacliffe (R) plays the part of

    London, UNITED KINGDOM: Daniel Radacliffe (R) plays the part of Alan Strang, on stage with Richard Griffiths (C) and Jenny Agutter, in Peter Shaffer's play Equus, at the Gielgud Theatre, in central London, 22 February 2007. Equus is a play by Peter Shaffer written in 1973, telling the story of a psychiatrist who attempts to treat a young man who has a pathological fascination with horses. AFP Photo Chris Young (Photo credit should read CHRIS YOUNG/AFP/Getty Images)

  • Richard Griffiths and Daniel Radcliffe during the curtain call Actors' Fund of America benefit performance of Equus, New York, America - 11 Jan 2009.

  • Actor Richard Griffiths poses for a photograph in New York, Wednesday, June 18, 2008. (AP Photo/Kathy Willens)

  • Actor Richard Griffiths poses for a photograph in New York, Wednesday, June 18, 2008. (AP Photo/Kathy Willens)

  • 'Withnail And I', Richard E. Grant (left), Richard Griffiths (centre), Paul McGann (right). 'Withnail And I' Film - 1987

  • Withnail & I

    British actor Richard Griffiths as Uncle Monty, donning a pair of rubber gloves in the movie 'Withnail & I', 1986. (Photo by Murray Close/Getty Images)

  • Relaxing At Monty's

    British screenwriter and director Bruce Robinson (right) relaxes with actor Richard Griffiths on the set of the movie 'Withnail & I' in London, 1986. (Photo by Murray Close/Getty Images)

  • Sherry At Monty's

    British actors Richard E. Grant and Richard Griffiths film a scene for the movie 'Withnail & I' in London, 1986. (Photo by Murray Close/Getty Images)

  • Withnail & I

    From left to right, British actors Richard E. Grant, Richard Griffiths and Paul McGann film a scene in Cumbria for the movie 'Withnail & I', 1986. British screenwriter and director Bruce Robinson stands between them. (Photo by Murray Close/Getty Images)

  • Monty Arrives

    British actors Paul McGann and Richard Griffiths film a scene in Cumbria for the movie 'Withnail & I', 1986. (Photo by Murray Close/Getty Images)

  • Withnail & I

    British actor Richard Griffiths as Uncle Monty in the movie 'Withnail & I', 1986. (Photo by Murray Close/Getty Images)

  • British actor Richard Griffiths as Uncle Monty in the movie 'Withnail & I', 1986. (Photo by Murray Close/Getty Images)

  • Withnail & I

    British actor Richard Griffiths as Uncle Monty in the movie 'Withnail & I', 1986. (Photo by Murray Close/Getty Images)

  • Richard Griffiths receives his OBE, for services to Drama, from Queen Elizabeth II during an Investiture ceremony at Buckingham Palace, London. 25 Jun 2008.

  • 60th Annual Tony Awards - Show

    Richard Griffiths, winner of Best Performance by a Leading Actor in a Play for The History Boys (Photo by Stephen Lovekin/WireImage for Tony Awards Productions)

  • 60th Annual Tony Awards At Radio City Music Hall - Press Room

    NEW YORK - JUNE 11: Winner of the Best Performance by a Leading Actor in a Play award Richard Griffiths poses with his award backstage at the 60th Annual Tony Awards at Radio City Music Hall June 11, 2006 in New York City. (Photo by Evan Agostini/Getty Images)

  • Fox Searchlight Pictures Presents A Screening Of "The History Boys"

    NEW YORK - NOVEMBER 7: Actors Samuel Barnett, Frances de la Tour, Richard Griffiths, and Dominic Cooper arrive at Fox Searchlight Picture's screening of The History Boys at the Dolby Screening Room November 7, 2006 in New York City. (Photo by Rob Loud/Getty Images)

  • BFI London Film Festival: ' Venus' Cast At The National Gallery

    LONDON - OCTOBER 19: (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) (L-R) Richard Griffiths and Leslie Phillips arrive at the pre-screening drinks reception for 'Venus' at The National Gallery on October 19, 2006 in London, England. (Photo by Dave M. Benett/Getty Images)

  • Arrivals At The Orange British Academy Film Awards

    LONDON - FEBRUARY 11: Richard Griffiths and guest arrive at the Orange British Academy Film Awards (BAFTAs) at the Royal Opera House on February 11, 2007 in London, England. (Photo by MJ Kim/Getty Images)

  • Harry Potter DVD & video launch party / Griffiths

    Actor Richard Griffiths at King's Cross St Pancras, central London, for the Harry Potter & The Philosopher's Stone - DVD & video launch party

  • Broadway Opening Of History Boys After Party

    NEW YORK - APRIL 23: (US TABS & HOLLYWOOD REPORTER OUT) Actor Richard Griffiths and actress Frances de la Tour attend the Broadway Opening Of 'History Boys' After Party at Tavern On The Green on April 23, 2006 in New York City. (Photo by Thos Robinson/Getty Images)

  • 60th Annual Tony Awards At Radio City Music Hall - Sprint Lounge

    NEW YORK - JUNE 11: Winner of the Best Performance by a Leading Actor in a Play, Richard Griffiths talks with Kathie Lee Gifford backstage at the Sprint Lounge during the 60th annual Tony Awards at Radio City Music Hall June 11, 2006 in New York City. (Photo by Peter Kramer/Getty Images)

  • Charles and Camilla attend The History Boys premiere - London

    Prince Charles, Prince of Wales meets writer Alan Bennett and actors Richard Griffiths and Frances de la Tour at the premiere of The History Boys in Leicester Square, London on October 2, 2006.Anwar Hussein/EMPICS Entertainment

  • AFI FEST 2006 Presented By Audi Screening Of "The History Boys" - Arrivals

    HOLLYWOOD - NOVEMBER 04: Actors Samuel Anderson, Richard Griffiths and Dominic Cooper arrive at the North American premiere of 'The History Boys' during AFI FEST 2006 presented by Audi held at the LOFT at Arclight Hollywood on November 4, 2006 in Hollywood, California. (Photo by Michael Buckner/Getty Images)

  • Steve McClaren receives honorary degree

    England football manager Steve McClaren (left) and actor Richard Griffiths stand on a balcony at the University of Teeside after they both received honorary degrees from the university.

  • England football manager Steve McClaren (left) and actor Richard Griffiths stand on a balcony at the University of Teeside after they both received honorary degrees from the university.

  • The Royal Film Performance Of Martin Scorsese's Hugo in 3D

    LONDON, ENGLAND - NOVEMBER 28: Richard Griffiths attends the royal film performance of Martin Scorsese's 'Hugo in 3D' at the Odeon Leicester Square on November 28, 2011 in London, England.(Photo by Ian Gavan/Getty Images)

  • Actors Danny DeVito and Richard Griffiths perform in "The Sunshine Boys" at the Savoy Theatre on May 17, 2012 in London, England. (Photo by Dave M. Benett/Getty Images)

  • From left, actors James Corden, Clive Merrison, Stephen Campbell Moore, and Richard Griffiths take the curtain call at the opening night of the play The History Boys, Sunday, April 23, 2006 in New York. The History Boys features the original London cast, and is the winner of the Olivier, Evening Standard and London Critics Circle Awards for Best Play. (AP Photo/Dima Gavrysh)

  • 'Pie in the Sky' Richard Griffiths.

  • Richard Griffiths and Johnny Depp at 'Sleepy Hollow' film premiere in 2000.