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12 April 2019, 15:11 | Updated: 12 April 2019, 17:42
Jimmy Carr and Jack Whitehall were among those paying tribute to comedian Ian Cognito, who died on Thursday night during an intimate gig in Bicester.
The stand-up comic fell ill at the Atic bar where the Lone Wolf Comedy Club was being held.
Paramedics were called after 10pm but a man was pronounced dead at the venue, a spokeswoman for South Central Ambulance Service said.
Carr, who worked with Cognito in the early days of his career, said the comic's death showed his commitment to the form.
He said: "Veteran stand-up comedian Ian Cognito has died on-stage - literally.
"The audience thought it was part of the act. Died with his boots on.
"That's commitment to comedy. I'll never forget his kindness when I started out & how god damn funny he was."
Whitehall described Cognito as a "true maverick", referring to his habit of starting his act by hammering a nail into the wall from which he would hang his coat.
He said: "Gigged with him when I first started out and he was always so much fun, had his own mythology on the circuit his exploits where legendary. A true maverick.
"Hope he's found somewhere to hang his coat in heaven."
Little Britain star Matt Lucas said: "In shock at the news of Ian Cognito's sudden passing.
"He was always kind to me when I started out, and brilliant and provocative and entirely original onstage. What a loss."
A statement from the ambulance service read: "We were called at 22:11 last night to Crown Walk in Bicester to a medical emergency.
"We sent a rapid response vehicle and an ambulance crew but sadly one patient passed away at the scene."
Thames Valley Police said no further investigation had been required.
Earlier actor and comedian Rufus Hound took to social media to say comedy had lost "one of the greats" while Katy Brand paid tribute to "Cogs", as he was known on the comedy circuit.
Cognito enjoyed cult status among his contemporaries and won the Time Out Award for Stand-up Comedy in 1999.
But the iconoclastic performer never achieved mainstream success, in part because of his unpredictable nature and routines.