John Leeson, the Voice Behind Doctor Who’s K9, Dies at 83
John Leeson, the British actor remembered for giving the robotic dog K9 his unmistakable voice in Doctor Who, has died at the age of 83. His son, filmmaker Guy Ducker, shared the news, saying Leeson passed away peacefully on November 1, 2026, following a period of illness. No further details about the cause of death have been released.
A Voice Fans Will Always Recognize
Leeson first brought K9 to life in the 1977 Doctor Who adventure “The Invisible Enemy,” starring alongside Tom Baker as the Fourth Doctor. Originally created for just one story, the intelligent robotic dog quickly won over viewers, with Leeson’s voice performance helping establish the character as a beloved part of the show.

K9’s precise speech, understated wit and courteous manner gave the mechanical companion a personality that audiences instantly connected with. Leeson continued playing the role in K-9 and Company, The Sarah Jane Adventures and various other Doctor Who productions, including audio dramas. When K9 returned to the television series in 2006, Leeson once again provided his familiar voice.

Former Doctor Who showrunner Russell T Davies paid tribute to Leeson, highlighting the humor, charm and character he brought to the much-loved robotic companion.
A Career Beyond Doctor Who
Born John Ducker in 1943, Leeson studied at the Royal Academy of Dramatic Art before establishing a successful career in television, theatre, radio and voice acting. His television appearances included Dad’s Army, Blake’s 7, The Bill and Doctors. He also originally performed Bungle in the popular children’s programme Rainbow.

Although audiences often recognized him most readily as K9’s voice, Leeson’s contributions extended well beyond that iconic character. He remained active in audio productions and continued revisiting a role that had secured its place in television history.
Remembering John Leeson
John Leeson did much more than provide a voice for K9; he gave the robotic character warmth, humor and a personality that audiences could recognize instantly. His performance transformed a small mechanical dog into one of the most memorable and enduring companions in Doctor Who.

Fans will remember Leeson for the happiness and character he brought to K9, along with a remarkable body of work that entertained generations of television audiences.