Sir Michael Parkinson's appearance on Good Morning Britain on Tuesday surprised some viewers.
The veteran interviewer was on the programme to discuss his new book 'Like Father, Like Son' which was inspired by his father's death 40 years ago.
Parkinson, who was joined by his son, wore a grey jumper and was wrapped up in a scarf as he spoke outside via video link from Maidenhead. However, some of those watching at home didn't recognise the star.
"Parky is hardly recognisable there #gmb," remarked one Twitter user, while another added that the 85-year-old "looked frail".
Parky looking frail, but still sharp as a pin, big part of my TV viewing growing up, brilliant interviewer. #GMB
Parkinson spoke about how he had addressed his father's death for his Life Stories interview with Piers Morgan last year, and that it brought up a lot feelings he had about the loss.
"In the end it's bound to come out because it's too potent, it's too much a part of your being," he explained. "That's what the conversation with [Morgan] did, I was fine and we joked about it before, 'You're not going to make me cry'.
"But it did, it opened a door that I had closed for too long, and the memory of [my father] in that bag and being in that bag, reduced to that, my father.
"It was too much for me. I don't regret crying for my father, you should be allowed to do that any time."
Parkinson retired from his self-titled chat show in 2007 after hosting for a collective total of 20 years across 31 series.
Sir Michael Parkinson
Sir Michael Parkinson
Comedians Eric Morecambe (left) and Ernie Wise with broadcaster Michael Parkinson during filming for the BBC television show 'The Morecambe and Wise Show', December 5th 1976. (Photo by Don Smith/Radio Times via Getty Images)
Queen Elizabeth II talking to singer Shirley Bassey who was among stars presented to her after her arrival at the Odeon Theatre in Leicester Square to see 'Close Encounters of the Third Kind'.
David Frost dishes out the Champagne at commercial television's Breakfast TV centre, after the early morning service went on air. From left: Robert Kee, Angela Rippon, David Frost, Anna Ford and Michael Parkinson.
Michael Parkinson (TV interviewer/presenter); 6th November 1968; (Photo by Monitor Picture Library/Photoshot/Getty Images)
Fashion designer Mary Quant, assisted by hair stylist Vidal Sassoon, centre, and tv personality Michael Parkinson, showing off some of the specimens in her latest venture, neckware for men. (Photo by PA Images via Getty Images)
Presenter Michael Parkinson (centre) interviewing comedians Harry Secombe (left) and Peter Sellers for the television chat show 'Parkinson', October 28th 1972. (Photo by David Edwards/Radio Times/Getty Images)
THE DICK CAVETT SHOW - Airdate: January 16, 1974. (Photo by Walt Disney Television via Getty Images Photo Archives/Walt Disney Television via Getty Images)
MUHAMMAD ALI;MICHAEL PARKINSON;DICK CAVETT;JOE FRAZIER
Celebrity football fans Elton John, Rod Stewart and Michael Parkinson take part in a charity football match, UK, 1974. (Photo by Michael Putland/Getty Images)
British television presenters Russell Harty (1934 - 1988) and Michael Parkinson (right) after attending a memorial service for the late Gracie Fields at St Martin-in-the-Fields, London, 15th November 1979. (Photo by Graham Turner/Keystone/Hulton Archive/Getty Images)
English broadcaster and talkshow host Michael Parkinson at home with his wife, TV presenter Mary Parkinson and their sons Nicholas (left) and Michael Jr. (right), England, 28th October 1980. (Photo by Mike Moore/Evening Standard/Getty Images)
Michael Parkinson pictured in Sydney, 1st June 1982. (Photo by Ron Burton/Daily Mirror/Mirrorpix/Getty Images)
Michael Parkinson (TV interviewer/presenter) with Janet Street Porter (TV presenter) and Clive James (humorist/journalist); October 1982; (Photo by Monitor Picture Library/Photoshot/Getty Images)
Mary Parkinson will be joining husband Michael as co-presenter on 'Good Morning Britain ' every Saturday between 7,00am - 9, 15am, Michael Parkinson and Mary Parkinson are pictured at the TV-am studios, 3rd January 1983. (Photo by Mike Maloney/Daily Mirror/Mirrorpix/Getty Images)
Henry Kelly (left) is to join TV-am and will present 'Good Morning Britain ' on Saturdays and Sundays while Michael Parkinson (right) is in Australia, 26th May 1983. (Photo by Alisdair MacDonald/Daily Mirror/Mirrorpix/Getty Images)
Chat show host Michael Parkinson (left) and comedian Jimmy Tarbuck attend a Variety Club Luncheon at the Hilton Hotel in London, 15th December 1988. (Photo by Dave Hogan/Hulton Archive/Getty Images)
ENGLAND : Michael Parkinson and Bob Hoskins model a red helmet, and the Truck Nose of Red Nose Day 1991 in 1991 in England. (Photo by Comic Trevor Leighton/Comic Relief via Getty Images)
ENGLAND : Michael Parkinson and Bob Hoskins wear the Nose of Red Nose Day 1991 while filming a sketch shown on the Night of TV in 1991 in England. (Photo by Trevor Leighton/Comic Relief via Getty Images)
The Duke of York (far left) chats with celebrities before the start of the Dunhill Celebrity Challenge held in aid of the Prince of Wales's Charitable Foundation at Wentworth today (Thursday). Left to right: Duke of York; Opera singer Dame Kiri Te Kanawa; Entertainer, Michael Parkinson, England rugby star, Jeremy Guscott and comedia,n Jimmy Tarbuck. Photo Tim Ockenden/PA (Photo by Tim Ockenden - PA Images/PA Images via Getty Images)
Portrait of broadcaster and journalist Michael Parkinson in disguise, wearing a false beard and eyebrows, to visit the first men-only barber shop opened by Vidal Sassoon in Brook Steet, London, March 23rd 1972. (Photo by Michael Webb/Keystone/Getty Images)
Singer Adam Faith (centre) celebrated 25 years in show business on TV-AM, live from London's Savoy Hotel, attended by pop star Elton John (at piano), TV personality Michael Parkinson (standing left) who celebrated his 50th birthday on March 28th, Michael's son Savoy chef, Nick who baked special cakes for dad, and Adam, and TV-AM "Good Morning Britain" presenter, Nick Owen. (Photo by PA Images via Getty Images)
UNITED KINGDOM - MARCH 06: Best Book Winner Pamela Stephenson With Her Husband Billy Conolly & Michael Parkinson, The 2002 British Book Awards Was Held At The Grovesnor House Hotel, London (Photo by Dave Benett/Getty Images)
TV presenter Michael Parkinson and football legend George Best get together to launch in London BBC 2's special George Best Night to mark his 50th birthday. The themed evening will be broadcast from 9.00pm on Sunday 19 May and will feature items on his best goals, his best Manchester United game (against Benfica in 1966), his best fantasy team and an in-depth interview with the man and his friends from the glory days of football.
Michael Parkinson in the royal box on day nine of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon.
Television chat show host Michael Parkinson who was awarded a CBE at Buckingham Palace. The popular interviewer, who has quizzed the world's top stars over 30 years in the business, claimed he did not really deserve the honour. * Parkinson claimed he did not really deserve the honour for doing "nothing more than walking down the stairs and talking to people". He said it was "marvellous" to receive the honour. * 24/11/00 of television chat show host Michael Parkinson. * 09/03/2002: Chat show host Michael Parkinson has labelled Celebrity Big Brother a "freak show and said the famous housemates deserved everything they got. The veteran interviewer took a swipe at the likes of Vanessa Feltz and Anthea Turner for agreeing to take part in the reality TV show. He is hosting BBC1's 2001 TV Moments and the episode where Feltz opened her heart to fellow housemate Jack Dee has been nominated. Feltz, with a failed marriage and faltering TV career behind her, broke down in tears in front of the cameras. "I must hand it to Jack Dee, his interview technique was brilliant, but on the whole, I don't like shows like Big Brother and you won't find me within 30,000 miles of one", Parkinson told What's on TV magazine.