Princess Diana tragically passed away in Pont de l’Alma Tunnel in Paris, France on August 31, 1997.

That afternoon, she and Dodi Fayed had made their way to the Ritz Hotel in the heart of the city.

After settling into the Imperial Suite at the luxurious five-star hotel, the princess called an anxious Prince William. He told her he was asked to participate in a photocall at Eton for the beginning of his third year.

The photocall was part of a deal between the press and the palace, according to Diana’s biographer Andrew Morton.

In the book Diana: Her True Story – In Her Own Words, Morton wrote about the agreement with the press: they would leave the royal princes alone in exchange for occasional official photo ops.

‘William was worried that there was a danger this his younger brother, Prince Harry, was being overshadowed.

‘It was a concern shared by Diana,’ he added.

‘As she had her hair done at the Ritz, she doubtless pondered on this conversation, her last with her eldest son.’

Princess Diana and Dodi Fayed in the lift of the Ritz hotel hours before they passed away

Diana arrives at the Ritz for dinner after spending a few hours at Dodi’s apartment

In the meantime, Dodi had left Diana to speak to her worried son and visited a nearby jewellery store called Alberto Repossi.

There the British-Egyptian millionaire picked up the ‘Tell Me Yes’ ring that he had sent to be altered.

Diana had chosen the ring, estimated to be worth around £11,000, while shopping with Dodi in Monte Carlo during their Mediterranean cruise.

Dodi had also talked to Hassan Yassin, a Saudi Arabian millionaire and his stepfather’s brother, who was coincidentally staying at the Ritz that evening.

‘It’s serious. We’re going to get married,’ Dodi allegedly told him. Hassan later recalled: ‘I was happy for him, for both of them.’  

That evening, Dodi and Diana intended to head to his apartment on the Champs-Élysées and then have dinner at Le Benoit, a restaurant near the Pompidou Centre.

Morton speculated, ‘Was this where Dodi planned to proclaim his love, give the ring—later discovered in his apartment—and propose to Diana?’

Their last discussions with close friends that night implied that their brief romance was on the brink of taking a serious and possibly lasting turn.

Charles, Diana and Harry watch as Prince William signs the Entrance Book at Eton College in 1995

The princess made a point to have her boys pictured together so they could ‘share the spotlight’, according to her confidante Richard Kay

In her final hours, William called his mother to say that a solo photocall at Eton had been arranged

Both Diana and William were worried that was worried ‘his younger brother, Prince Harry, was being overshadowed’

William and Harry pictured at Westminster Abbey for the funeral of Princess Diana on September 6, 1997

As well as William, one of the last people Diana called on the night of her death was none other than Richard Kay, the Daily Mail’s Editor at Large.

He recalled that Diana was supposed to be back in London that night but bad weather had delayed her for 24 hours.

‘The delay meant she would not arrive back at Kensington Palace until Sunday,’ Richard explained, ‘when William and Harry were due to join her after their three-and-a-half weeks with Prince Charles and the royals at Balmoral.

‘Without doubt, she would have been utterly baffled at the criticism earlier this summer that somehow she had abandoned the boys to go off with Dodi.

‘It had been carefully arranged that they would spend part of the summer with their father and an equal amount of time with her,’ Richard wrote in an article for the Daily Mail to mark the 20th anniversary of Diana’s death.

Richard also remembered Diana’s ‘dismay’ that William was ‘expected to face a photocall at Eton at the beginning of the forthcoming term without Harry’. 

He wrote: ‘Diana had established that, wherever possible, the boys should share the spotlight.

‘It was a deal that Charles faithfully kept to throughout the following years.’

Just over a year after the first anniversary of his mother’s death, Harry arrives for his first day at Eton with his father Prince Charles

The young prince takes part in a photocall on his first day at Eton College

In his bombshell memoir Spare, Harry alleged that William ‘told me to pretend I didn’t know him’ while both boys were at Eton

The Wales brothers both attended Eton College (pictured). William started in 1995 while Harry started in 1998

Harry started at Eton in 1998 – three years after William started attending the prestigious private school.

But in his bombshell memoir Spare, he alleged that William ‘told me to pretend I didn’t know him’.

‘For the last two years, he explained, Eton had been his sanctuary. No kid brother tagging along, pestering him with questions, pushing up on his social circle. 

‘He was forging his own life, and he wasn’t willing to give that up.’