He was due to meet the Queen with Ms Markle's mother in the days leading up to the wedding being staged at St George's Chapel at the castle.
Meghan seems to have maintained a strong relationship with her dad.
Monday afternoon, Markle's TMZ report ricocheted across the internet.
Markle secretly hired an LA-based paparazzi to take "candid" photos of him preparing for the big day, it was revealed this week.
Britain's Prince Harry and his USA fiancee Meghan Markle have chosen George and Charlotte, the children of the royal's elder brother Prince William, to be among the bridesmaids and page boys for their wedding, his office said on Wednesday. His absence is a result of a revelation that he posed for the paparazzi in a staged photo outside his house in Mexico.
Before the ceremony, Mr. Thomas was expected to perform the duty of the meeting of the in-laws some time this week, when he was to join ex-wife and the bride-to-be's mother, Doria Ragland, at tea with Queen Elizabeth II, Prince Charles and Camilla.
As the Christian customary, Meghan's father was to walk her down the aisle on her D-day. It would make sense for a mother to move closer to her daughter, especially if new Duchess duties kept her overseas all the time.
Zalie Warren, another of Harry's godddaughters, who is two. "And if you stick to those, you won't go far wrong".
Doria is thought to have arrived in the United Kingdom for the royal wedding, spotted on her way to Los Angeles Airport on Tuesday evening, carrying a Burberry garment bag.
It described the neighborhood as "gang-scarred" and dominated by "tatty one-storey homes".
On May 19, Meghan Markle will be the first American to marry into the British royal family since 1937. This weekend, reports in the London Times and The Mail on Sunday said that Markle was not only staging the portraits with the paparazzi, but getting paid for them. Other UK media reports said the package also contained a racist letter. Politician Paul Nehlen posted a photoshopped image of Markle with the head of Cheddar Man, whose 9,000-year-old remains indicate the dark-skinned man was an ancient Briton.
Wendy Williams, 53, didn't spare Meghan Markle, 36, one bit during her "Hot Topics" segment on May 15.
"This is a deeply personal moment for Ms. Markle in the days before her wedding", the palace statement said.
Thomas Markle, if you somehow don't know, is Meghan Markle's father.