Actor Patrick Macnee, star of The Avengers TV series, has died in California at the age of 93.
Macnee also played roles in theatre, appearing on Broadway, and served in the Royal Navy during World War Two.
A statement on the actor's website read: "Wherever he went, he left behind a trove of memories."
He died peacefully at his home in California's Rancho Mirage on Thursday, Rupert said.
James Bond allyBorn in London, Macnee grew up in Berkshire and was educated at Summerfields Preparatory School and Eton.
At the age of 11, he acted in Henry V opposite a young Sir Christopher Lee. He first appeared in the West End while still in his teens.
He played a number of minor roles - including one in Laurence Olivier's 1948 film version of Hamlet - before rising to fame in the original Avengers series between 1961 and 1969.
The series developed a cult following around the world, the BBC's Los Angeles reporter Peter Bowes said.
Steed was known for his dress sense, always donning a bowler hat and carrying an umbrella, which was used as a secret weapon.
Macnee returned when that series was reprised as The New Avengers in the 1970s, appearing alongside Joanna Lumley's Purdey and Gareth Hunt's Mike Gambit.
Later, he starred on Broadway in Anthony Shaffer's Sleuth, touring internationally with that play and several other productions
He also appeared in the 1985 James Bond film A View to a Kill, playing an ally of Roger Moore's Bond character, and made a cameo appearance as the head of a record company in This is Spinal Tap.
Sir Roger tweeted: "So very sad to hear Pat Macnee has left us.
"We were mates from 1950s and I have so many happy memories of working with him. A true gent."
Macnee featured too as a guest star in dozens of British, American and Australian TV productions.
'Ahead of their time'In a 2014 interview with The Lady magazine, Macnee said he believed The Avengers was a success because it "did something different and did it better."
He told the magazine: "It was beautifully written, the ideas were very good, way ahead of their time and they incorporated fantasies for people who dreamed of doing exciting things."
Macnee had two children, son Rupert and daughter Kate Woodville, and one grandson.
He was married three times, including to actress Katherine Woodville, with whom he acted in The Avengers.
He had been a US citizen since 1959, according to the AP news agency.