Princess Diana’s death sparked many conspiracy theories, some of which remain unresolved to this day.
While some thought it was a murder, others surmised that Diana’s last day was a mere accident.
Official investigator Eric Gigou, of France’s Criminal Brigade, however, told the Channel 4 documentary that all of these theories are “wacky” except for one, which bothers him deeply to this day.
He said: “The Criminal Squad is a special unit responsible for dealing with complex cases.
“We are not going to lower ourselves to dismantle conspiracy theories, each one more outlandish than the other.
“All to satisfy the slightly misplaced curiosity of a certain part of the public.
But, Mr. Gigou added: “In my mind, the only door that remains open is the testimony of the driver of the Fiat Uno.”
Fabrice Cuvillier, also from the Criminal Brigade, added: “This Fiat Uno exists, that’s for sure. It’s not a hallucination. It’s not a fantasy.
“It’s not something we threw out to create a diversion. He goes out.
“We did not find this Fiat. But it would be dishonest of me to look you in the eye and say, “We didn’t let the Fiat pass.
“I don’t think so, but I’m not 100% sure.”
The head of the crime squad, Martine Monteil, declared that she had “always been frustrated by this Fiat Uno because I like well-finished business.
“It’s over there for sure. Unfortunately we don’t have it. But you know, the driver of the Fiat Uno, he’s not the real culprit.
“He drives quietly then a Mercedes comes at full speed and hits him.
She concluded: “The responsibility lies with the Mercedes.”