Darryn Lyons has raised fresh doubts about the official details of the death of Princess Diana, saying he has "huge questions" about what happened in the infamous Paris car crash.

The former king of the paparazzi told The Daily Telegraph that the official account of her tragic 1997 accident, "isn't necessarily the truth."

The 53-year-old told the paper: "Everyone says it was a tragic accident... some very strange things happened that night and I was a part of many of the strange things that happened that night."

The former head of Big Pictures photo agency, which used paparazzi photos said he "fears" what he makes public as he went through some "some very funny things" after Diana's passing.

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However Darryn admits he has "no proof that the Princess of Wales was murdered", the DailyMail reports.

"I don't think we'll ever get to the bottom of the truth of the story. I don't even think her sons know .... they would have been told the story but it isn't necessarily the truth," he said.

The flamboyant photographer said the princess' death was the "most traumatic" moment in his life, in his column in The Geelong Advertiser.

He claims "hell broke loose" after the 1997 crash in a Paris road tunnel which left photographers locked up, offices raided and papers were seized.

"I feel lucky I wasn't killed in all the cloak-and-dagger stuff that was going on at the time," he wrote.

"There were death threats against me, and my staff were abused on the street. The aggression shocked me."

Darryn, who was accused of selling photos of dead Princess Diana through his company Big Pictures, said his office was raided and his phone lines were tapped.

The situation escalated when the former mayor of Geelong, Victoria, heard a ticking noise believed to be an explosive device in his office which had no power but surrounding buildings did.

Princess Diana suffered fatal injuries and died along with her boyfriend Dodi Fayed and her driver and security guard Henri Paul on August 31, 1997.

Diana, Princess of Wales with her sons, Prince William and Prince Harry. Photo / Getty Images
Diana, Princess of Wales with her sons, Prince William and Prince Harry. Photo / Getty Images

An inquest, which Darryn gave evidence in, was held in London and ended in 2008.

It found Princess Diana died unlawfully, blaming negligent driving by Henri Paul affected by paparazzi, which contributed to the crash.

Darryn's photographer in Paris, Laurent Sola, took photos of the late princess dead in her car, which he still owns.

However the gallery owner said he has not sold the photos and never will despite once being offered a quarter of a million pounds ($444K AUD) by British and American news publications.