Meghan Markle's father wants to walk his daughter down the aisle when she weds Prince Harry, but is in hospital, a US report says.
The news comes a day after doubts were cast over whether Mr Markle would attend Saturday's royal wedding in Windsor.
He is believed to have suffered a heart attack a week ago and is back in hospital after experiencing serious chest pains, US celebrity website TMZ said.
The website said Ms Markle had tried calling him on Monday and sent him a text saying she loved him and was concerned about his health.
Mr Markle allegedly staged paparazzi photographs of himself in the run-up to the wedding at Windsor Castle, and it was reported that he had withdrawn from the ceremony as a result on Monday.
However, Ms Markle is believed to have told him she does not have any ill feelings towards him for staging the photos.
He said that after thinking about the situation the incident was not a "serious transgression", but simply "stupid.
"I hate the idea of missing one of the greatest moments in history and walking my daughter down the aisle," he told TMZ.
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"I don't think the Queen is thinking about what I'm doing."