John Leeson, voice behind Doctor Who’s K9, dies at 83

by | Nov 2, 2026 | Entertainment

John Leeson, voice behind Doctor Who’s K9, dies at 83

John Leeson, born John Ducker in 1943, passed away at 83 following a period of illness over the summer months, according to an announcement made by his son Guy Ducker on social media. Leeson trained at the Royal Academy of Dramatic Art and built a lengthy career spanning both theatrical and television work across numerous productions.

Leeson became widely recognized for voicing K9, the mechanical canine companion introduced to Doctor Who in 1977 during Tom Baker’s tenure as the Doctor. The character, created by Bob Baker and Dave Martin, was originally designed for a single episode titled “The Invisible Enemy” but proved popular with audiences, leading the production team to make K9 a permanent member of the Tardis crew. Leeson continued voicing the character until 1981, though David Brielly also provided the voice for a period. The role yielded the character’s signature catchphrase, “Affirmative, Master.”

Beyond Doctor Who, Leeson’s television credits included appearances in Dad’s Army, Sorry!, Crown Court, Longitude, The Bill, and Blake’s 7, alongside work as a continuity announcer for Channel 4. He also portrayed Bungle on the children’s program Rainbow and reunited with former Doctor Who companion Elisabeth Sladen in the spin-off K-9 and Company, as well as later in a 2006 Doctor Who episode and the subsequent Sarah Jane Adventures series.

Leeson continued working as K9, providing voice work for Big Finish audio dramas in the year prior to his death. Former Doctor Who showrunner Russell T Davies and other colleagues in the entertainment industry paid tribute to Leeson following his passing, describing him as talented, professional, and possessing a distinctive vocal performance that defined the character for generations of viewers.

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