Sir Michael Parkinson appeared on Tuesday morning's Good Morning Britain alongside his son Mike.
The 85-year-old television star was interviewed by Piers Morgan and Susanna Reid after his moving Life Stories interview with Morgan last year.
His emotional interview on Piers' programme had prompted him to write a book after being asked about his father's death.
Michael had broken down in tears on Life Stories as he recalled his dad's death which happened 40 years earlier.
During his GMB interview, he told Piers he had "locked his grief away in a compartment" until the moment he was asked about it on the show.
He explained: "In the end it's bound to come out because it's too potent, it's too much a part of your being.
"That's what the conversation with [Piers] 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."
During his TV appearance, some viewers were concerned as they remarked they "didn't recognise" the star.
One tweeted: "Parky looking frail, but still sharp as a pin, big part of my TV viewing growing up, brilliant interviewer. #GMB ".
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Another said: "#GMB if I seen him in a picture I'd of never of known it was Michael Parkinson".
"Parky is hardly recognisable there #gmb," remarked a third.
A fourth added: " When did Parky get so old? Mind you, its a privilege denied to so many… #gmb ".
Good Morning Britain airs weekdays at 6am on ITV.
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