Furthermore, Mclaren said that the expert who examined Le Van Than's car failed to inspect the Fiat for damage along the left side of his car.
"To my utter disbelief, I was told the expert failed to properly inspect the Fiat for damage along the left side of his car. Damage that I knew was there."
The homicide cop joined investigative journalist Dylan Howard in Paris, where they spoke with Le Van Than.
According to the homicide detective, the man had left the scene of the car crash out of fear of imprisonment.
WATCH: Princess Diana's death wasn't an accident' says a couple who witnessed the car crash
Us Weekly reported that McLaren’s call for the inquest to be reopened is based on the same claim from Michael Cole, a former spokesman for Mohamed Al-Fayed - whose playboy billionaire son, Dodi Al-Fayed, tragically died in the fiery crash with Diana and driver Henri Paul on that fateful night inside the Pont de l’Alma tunnel.
The publication wrote that Cole had told McLaren and Howard the following:
"As a matter of urgency, this information should be conveyed to an officer of the court. If it is reported to the French police or the British police, then there will be the temptation, or the possibility anyway, that somehow the information will be buried. … But it certainly is prima facie cause for a new thoroughgoing look at what went on, because if this was going on, what else was going on?"
Diana: Case Solved touts itself as "the definitive account and evidence that proves what really happened" on August 31, 1997, and will be released on September 17.