Comedian John Sessions has died at the age of 67 following a heart attack, his agent has confirmed.

The star was a regular guest on Whose Line Is It Anyway? in the 1980s and '90s and also appeared on Spitting Image and QI, as well as dramas such as Victoria and Porterhouse Blue.

In a statement, Sessions's agent Alex Irwin said in a statement: "It is with great sadness we can confirm that on Monday, the actor John Sessions died at his home in south London. He will be hugely missed."

Stephen Fry, who worked with Sessions multiple times, wrote on Twitter: "I'm already missing Johnny Sessions dreadfully. As warm, vulnerable, lovable and loving as anyone can be. And so so much talent. He could make me laugh until I was sick and dizzy with pleasure and exhaustion. I can't bear that he's gone."

Impressionist and comedian Rory Bremner said: "Jeez. Another one. John Sessions. Just the best, he'd blow everyone away on Whose Line with his speed of thought & breadth of reference. Utterly absorbed by Hollywood, its characters and stories, brilliant raconteur, genius mimic. A flash of brilliance just went out."

Whose Line legend Josie Lawrence tweeted: "Just found out. Oh no. Lovely John. A true wit and a very kind soul."

Watch Sessions impersonate Alan Rickman during an episode of QI below: