"I hate the idea of missing one of the greatest moments in history and walking my daughter down the aisle", he told TMZ from hospital, where he was suffering chest pains, a week after reportedly suffering a heart attack.
A self-proclaimed "royal super-fan", Werner, a married, stay-at-home mom, has made the trip across the Atlantic for several royal occasions in Britain, including the weddings of Prince Andrew in 1986 and Prince William in 2011 and Queen Elizabeth's 90th birthday celebration in 2016.
Our thoughts are with Thomas and the Markle family - here's hoping for a safe, successful, and uneventful surgery tomorrow morning!
The bride-to-be's parents are divorced and while Harry has been pictured with her mother, Doria Ragland, 61, there had been speculation about how Mr. Markle, a former lighting director for TV soaps and sitcoms, would feature.
Some 79 worldwide broadcasters, including outlets from the United States, Australia, New Zealand and Japan, are planning to report on Markle and Harry's wedding. Mel B said during an interview that she will attend the royal event, and she also confirmed that the other members of the British girl group received an invite.
The wedding of the year is just a few days off, but in Hollywood today they were already celebrating.
But they have been overshadowed by Ms Markle's relatives on her father's side, who have been barred from Saturday's nuptials following unwelcome stories of bust-ups, heavy drinking - and even an arrest. Tracy Dooley, who was once married to Markle's half-brother, Thomas Markle Jr, flew into Heathrow on Monday with their two sons, Tyler, 25 - who reportedly works as a cannabis farmer in OR, where marijuana is legal and plans to create a hybrid called Markle's Sparkle - and Thomas, 26, a fast-food chain restaurant manager. She's way out of her league to tell me I can't speak.
"She's very close to her mother, though, isn't she?"
According to celebrity news website TMZ, he decided against travelling from his home in Mexico to accompany his daughter down the aisle at Windsor Castle due to his health - and to spare her further embarrassment. "So perhaps her mama gives her away", said Joan Budgin.