John Leeson, the actor whose voice made Doctor Who’s robotic dog K9 one of the programme’s most recognisable characters, has died at the age of 83. His son, Guy Ducker, announced the news on Facebook, saying Leeson had experienced a summer of illness and that his death was peaceful.

Ducker also thanked the Doctor Who fan community for the affection it had shown his father over the decades, saying that the support had meant a great deal to both of them.

Born John Ducker in 1943, Leeson trained at the Royal Academy of Dramatic Art after initially working as a hospital porter. He built a career in theatre and television, appearing in programmes including Dad’s Army, Sorry!, Crown Court, The Bill, Vanity Fair, Doctors and Blake’s 7. He was also a continuity announcer for Channel 4 and played Bungle in the children’s series Rainbow.

Leeson’s defining role began in 1977, when K9 was introduced in The Invisible Enemy, a Doctor Who story starring Tom Baker. Created by Bob Baker and Dave Martin, the metallic dog was originally intended to appear only in that story. The production team later decided to retain the character, believing K9 would appeal to younger viewers.

K9 remained part of the Tardis team until 1981, with David Brierly providing the voice for part of that period. Leeson established the character’s familiar response, “Affirmative, Master”, and later returned to the role for Doctor Who’s 20th-anniversary special and the spin-off K-9 and Company.

He reunited with Elisabeth Sladen, who played Sarah Jane Smith, in the 2006 Doctor Who episode School Reunion. Leeson and Sladen subsequently appeared in The Sarah Jane Adventures, which ran on CBBC from 2007 until Sladen’s death in 2011.

Former Doctor Who showrunner Russell T Davies paid tribute to Leeson on Instagram, saying there had been no question of asking him to provide K9’s voice when the character returned. Davies praised his portrayal as sophisticated, haughty, witty and innocent, adding that Leeson was “a true gent” and that his death was a great loss.

Producer Keith Barnfather described Leeson as kind, considerate, professional, charming, talented and unassuming. Lisa Bowerman, whose work includes several Doctor Who productions, remembered him as an “utterly lovely man” and an iconic voice.

Leeson continued to perform as K9 in Big Finish audio dramas as recently as last year. Reflecting on the role, he once recalled being told by BBC producers after his debut that there would be no work beyond the first episode. Instead, he remained associated with Doctor Who for decades.

Sources: The Guardian World.