Tampa, Florida - A US court has dismissed a defamation case brought against Meghan Markle by her half-sister.

Samantha Markle had taken legal action against Meghan Markle, the wife of Britain's Prince Harry, over comments she made to Oprah Winfrey and on her Netflix show, Harry And Meghan.

However, she will not be able to refile the case after Florida judge Charlene Edwards Honeywell dismissed it with prejudice.

The judge, ruling in favor of the former Suits actor, said in a 58-page decision that the plaintiff had "failed to identify any statements that could support a claim for defamation or defamation-by-implication."

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Meghan's lawyer, Michael J. Kump, said: "We are pleased with the court's ruling dismissing the case."

Samantha Markle, who has the same father as Meghan, claimed the couple's comments during the high-profile tell-all interview with Winfrey in 2021 were "demonstrably false and malicious lies."

Meghan said to Oprah that she grew up as an only child, also saying her sister changed her surname back to Markle after she began a relationship with Harry.

The judge said Meghan's statements could not be defamatory because they were either an opinion, "substantially true based on judicially noticed evidence," or "not capable of being considered defamatory."

She went on: "That plaintiff used one last name and then the name Markle soon after reports of defendant's relationship with Prince Harry were published is substantially true, based on the exhibits in the record, of which the Court has taken judicial notice, and the Court cannot reasonably infer otherwise."

Samantha Markle first brought a defamation case against her younger sister in March 2022, alleging the duchess had defamed her by giving information to an unauthorized biography called Finding Freedom and by discussing their relationship with Winfrey on live television.

Judge Honeywell found the duchess could not be liable for the contents of the book because she did not publish it and dismissed the case.

Meghan has not spoken to her half-sister for years.