A royal biographer received death threats after claiming Britain's Princess Diana was murdered.
Brian Watson had planned to release a documentary after research convinced him that assassins deliberately caused the horrific by taking over the steering of her car with a device, but after sending the script to film studios he became a victim of intimidation.
The writer told the Daily Star newspaper that he was about to make his claims known to the public when he received a phone call telling him to, "Drop the idea if you value your family's life."
Diana - the mother of Prince William and Prince Harry - was killed on August 31 in 1997 at the age of 36 along with her lover Dodi Fayed after her drunken chauffeur, Henri Paul, tried to outrun paparazzi through the Parisian tunnel.
Brian believes assassins were following the Mercedes in a white Fiat Uno before using their remote control device to smash the car into a wall and he even researched how the alleged killers could have installed the device.
He explained: "So I phoned up my local Mercedes dealership and asked how long it would take to put a new one in. They said about half an hour or so. Then I asked if you could perhaps control the car with the right computer. He said: 'Yes, you could.' When I told him why I was asking him he went cold."
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