John Leeson, the actor best known for voicing robot dog K9 in Doctor Who and its spin-offs, has died aged 83. He was also known for character work across TV shows such as Dad's Army, Sorry!, Crown Court and Longitude.
His son, Guy Ducker, announced the news in a Facebook post: "I regret to announce the death of my father, John Ducker, a.k.a. John Leeson, at 3:03pm today after a summer of illness. The end was peaceful." He included a William Shakespeare quote: "Good night, sweet prince, and flights of angels sing thee to thy rest."
Tribute from Russell T Davies
Former Doctor Who showrunner Russell T Davies paid tribute on Instagram, sharing a post of Leeson with K9. "The voice of K9, and a fine, fine actor," Davies wrote. Davies revived Leeson's character in 2006, after reviving the BBC sci-fi series.
Recalling this, he said: "There was no question that we'd ask John to provide the voice, it was impossible to imagine anyone else. And really, what a performance, what a character: a posh dog, uppity, haughty, wry, but somehow innocent too, and so funny."
"God he was good," the 63-year-old continued. "Pitched perfectly so that kids could impersonate him. That's not easy, that's hell of a piece of acting. And he was wonderfully dedicated to that character for... gasp, six decades!"
Career highlights
Leeson trained at the Royal Academy of Dramatic Art before a career on stage and screen. Early TV credits included Dad's Army and The Spanish Farm, and he played Bungle The Bear in children's series Rainbow. He appeared in Crown Court, but his most memorable role came in 1977 in Doctor Who, alongside Tom Baker in the fourth incarnation of the title character.
Baker has previously spoken about disliking K9, but the robot dog was a hit with viewers and continued to appear for several years. Leeson reprised the role in audio dramas and spin-offs, including CBBC's The Sarah Jane Adventures, before returning to the original programme after its revival. Other credits include The Bill, Vanity Fair, Doctors and Blake's 7, and he was regularly heard as a continuity announcer on Channel 4.
Final years and legacy
Davies remembered: "He'd phone me up and chat sometimes – on the landline, I remember, those were the days. Including one time when he hadn't been paid! But he was so gracious about it. A true gent, and a great loss. Sympathy to his family and friends. Good night, sir. Affirmative!"
In 2026, Leeson reunited with Baker, who played Sherlock Holmes in the audio drama Sir Sherlock: The Red Letter Day, with Leeson as Doctor John Watson.
