Roger Lloyd-Pack (8 February 1944 – 15 January 2014) was an English actor. He was best known for the role of Trigger in Only Fools and Horses and Owen Newitt in The Vicar of Dibley. He played Barty Crouch, Sr. in Harry Potter and the Goblet of Fire. On 15 January 2014, Lloyd-Pack died of pancreatic cancer at his home in Kentish Town at the age of 69
Stephenie Lesley McMillan (20 July 1942 – 19 August 2013) was an internationally recognised British set decorator. She was the creative genius who created the beautiful, magical world of Harry Potter films by her set decoration.
Derek Deadman (11 March 1940 – 22 November 2014) was a British character actor who appeared in numerous British films and television series over a 40-year period. He portrayed Tom, the landlord of The Leaky Cauldron, in Harry Potter and the Philosopher's Stone. He died November 21, 2014, in Frespech, France
Richard Griffiths (31 July 1947 - 28 March 2013) was the actor who portrayed Vernon Dursley in the Harry Potter films. He died at the University Hospital Coventry on 28 March 2013, from complications due to heart surgery - Harry Potter Wiki
Dave Legeno (12 October, 1963 - 6 July, 2014) was a British actor, boxer, and mixed martial artist. He portrayed Fenrir Greyback in the film adaptation of Harry Potter and the Half-Blood Prince and Harry Potter and the Deathly Hallows: Part 1 and Part 2. On Sunday 6 July 2014, hikers found Legeno’s body in Death Valley, California. It appears that Legeno died of heat-related issues - Harry Potter Wiki
Rik Mayall (7 March, 1958 - 9 June 2014) was an English comedian. He played Peeves the Poltergeist in the film adaptation of Harry Potter and the Philosopher's Stone; however, his scenes were cut from the finished film. He died of acute cardiac arrest aged 56 - Harry Potter Wiki
Jimmy Gardner (24 August 1924 – 3 May 2010) was a British actor who played the Knight Bus driver Ernie Prang in Harry Potter and the Prisoner of Azkaban. During World War II, Gardner served in the Royal Air Force as an air gunner with No. 10 Squadron.
Sir Richard St. John Harris (1 October, 1930 – 25 October, 2002) portrayed Albus Dumbledore, Headmaster of Hogwarts School of Witchcraft and Wizardry, in the first two film adaptations of the Harry Potter books. He died of Hodgkin's Disease at the age of 72