It had been announced earlier this month that Mr. Thomas, a retired Hollywood lighting engineer who lives in Mexico, would walk his daughter to the altar at St. George's Chapel in Windsor Castle, where the 36-year-old former actress is set to Wednesday Prince Harry (33), in front of 600 guests and an worldwide television audience of millions on May 19.
According to media reports out new on Tuesday afternoon in TMZ, Thomas will undergo major heart surgery at 7:30 a.m. tomorrow morning.
Markle threw the wedding plans into confusion earlier this week when he said he would not attend the May 19 nuptials because he did not want to embarrass his daughter.
"This is a deeply personal moment for Ms Markle in the days before her wedding".
Sharing a parent with United States of America, home of Markle's former show, Suits, NBC gained access to her Hollywood circle - including NBCU cable entertainment chair and Markle mentor Bonnie Hammer - for May 16's Inside the Royal Wedding.
Mr Markle told the publication he now believes that was a "stupid" move but not a "serious transgression".
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Ms Markle's half-sister, Samantha Markle, said she hoped her father would be at the ceremony.
Born in 1945, of Dutch-Irish descent, he grew up in Pennsylvania and met Meghan's mother, Doria Ragland, in the late 1970s.
He was seeking to redress damage to his image by "paparazzi who have photographed him in the most unflattering circumstances", says the website. "Meghan always has her dog on a lead, and since she has started walking her dog in the park some of us regular dog walkers been asked to put dogs on leads".
"Prince Harry has informed The Queen and other close members of The Royal Family".
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Thomas, who is spending his retirement in Mexico, met Prince Harry during a trip to Toronto, Canada, in 2016 and was apparently won over by the royal.
Dooley is expected to cover the royal wedding for an American broadcasting network and said she "will be in the front row cheering them on" in Windsor.