The TV host took part in Play Your Cards Right with husband Eamonn Holmes last Saturday night and cried at the huge win for charity.
Explaining the emotional moment to panellists Nadia Sawalha, Coleen Nolan and Saira Khan, she said: "When it’s close to your heart and you’re representing a charity, if that card had been the wrong turn we’d have lost that money, so you have this gamble.
"So even though I knew we’d won, I wept like a baby [watching it] the second time."
She continued: "Oh see it’s set me off again, now!"
As Nadia Sawalha asked her, "How did that feel in that moment?" Ruth replied: "I just thought of my dad.. you know..."
Ruth has previously spoken about the heartbreak of her father Dennis' experience with Alzheimer's.
Dennis, who died in 2012, lived with the disease for 13 years.
Speaking on Loose Women in 2018, Ruth said the diagnosis was scary but also brought relief.
"I hope that doesn’t sound strange but when you know something is wrong and you’ve been looking into it and wondering and wondering ‘why are they behaving like this?’.
"When we got that diagnosis as a family, there was an element of relief, ‘Oh, that’s why.’ Then we understood it."
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