India, July 2 -- Meghan Markle is being warned to stay quiet about the Royal Family or will face a fate similar to Princess Diana, per a Radar Online report.

The warning, steeped in longstanding conspiracy theories and suspicions surrounding Diana's 1997 death in a Paris car crash, comes amid growing concern that the Duchess is treading dangerous ground.

Radar Online claimed a secretive group of enforcers, 'Gray Men,' have resurfaced, and Meghan could become their next target if she continues speaking out.

"I fear if Meghan and Harry's star rises too high, that will be perceived as the courtiers Princess Diana called men in grey as a threat to the heir," Royal biographer Anne Pasternak, who has written about Diana's life, told Radar On...