The star, best known for appearances on TV shows “Whose Line Is It Anyway?” and “Spitting Image,” passed away at his home in South London on Monday.

In a statement, agent Alex Irwin confirmed Sessions’ death.

Sessions’ friend Ronni Ancona paid tribute to him today.

She told the Telegraph: “He was that rare commodity, a towering intellect who was able to translate his vast intelligence into highly-accessible, unadulterated comedy.”

Ancona said his performances were “like watching a high-wire act without a net — the equivalent of chomping into a dangerous Japanese fish”.

Broadcaster Danny Baker wrote on Twitter: “Shocked to hear that John Sessions has died at 67.

“Terrific company always and a true talent. His roles at the heart of this, my favorite radio series, have given endless pleasure to me and will continue to do so always. Travel easy, chum…”

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Getty Images

Radio Times via Getty Images

A tweet from the team behind panel show “QI” said: “John Sessions was a panelist on QI’s first-ever episode: Series A, Episode One, ‘Adam’.

“His incredible wit and encyclopedic knowledge played a huge part in the show’s history and everyone at QI is deeply saddened to learn of his passing.”

Actor and writer Robert Webb wrote on Twitter: “Bobby Ball and now John Sessions! Two very different performers who both absolutely inspired and delighted me at different times. Lovely, funny men.”

Blur musician Graham Coxon said: “John sessions… was mega bright and funny.. that’s a great shame. RIP.”

Mariella Frostrup wrote: “So sad to hear of the death of #johnsessions. A great actor and an interesting man who I always enjoyed encountering.”

Sessions was born in Ayrshire, Scotland and studied at the Royal Academy of Dramatic Art in London.

He became prominent on British television in the 1990s, appearing on “QI” and “Have I Got News For You.”

The actor also appeared in the surreal comedy series “Stella Street,” as well as “Spitting Image” and “Skins.”

Sessions also appeared in films, including in “Henry V” directed by Sir Kenneth Branagh in 1989 and as Edward Heath alongside Meryl Streep in the Margaret Thatcher biopic “The Iron Lady.”