Princess Diana, one of Britain’s most loved royals, is being honored with an HBO documentary almost 20 years after her tragic death in Paris. The highlight of the new authorized take on her life by HBO Documentary Films was that the story will be told by her sons, Prince William and Prince Harry.

“This film will show Princess Diana in a way she has never been seen before, through the eyes of the two people who knew her best,” Nick Kent, the documentary’s executive producer, said in a statement.

The documentary, which is expected to mark the 20th anniversary of Princess Diana’s passing, will be based on conversations with the princes as they talk about their mother and her influence on their lives. The production will also feature interviews with other key figures from the royal’s life — “many of whom have never spoken publicly before” — along with new archival material.

Read: Princess Diana’s Death Was A ‘Total Chaos’ For Prince Harry, Royal Son Took Counseling After Breakdown

Both the princes were actively engaged in humanitarian work and HBO’s documentary will talk about their mother’s contribution to public life, along with her work in the charitable and humanitarian sector. According to reports, this will include Diana’s endeavors in the fields of landmines, homelessness, children’s rights and HIV and AIDS.

Diana And The Red Cross - January 1997 Diana, Princess of Wales, talks to amputees during her visit to Angola as part of the Red Cross campaign against land mines, January 1997. Photo: Getty Images

While no premiere date has been set for the new film produced by Oxford Film and television for ITV in the United Kingdom, it is expected to release later this year . Ashley Gething will be the producer and director on the project.

There is another separate documentary on Princess Diana that is expected to premiere on ABC in August this year. ABC partnered with People magazine for the project, which is expected to include archival footage of Diana along with interviews with “Diana experts.”

Both of Diana’s sons have previously discussed how they dealt with their mother’s death.

Read: Did Prince Charles Love Princess Diana? Old Question Revived In New Book

In the BBC documentary “Mind Over Marathon,” Prince William said that was a part of him that couldn’t get over Diana’s death.

“I still feel, 20 years later about my mother, I still have shock within me… People say shock can’t last that long, but it does. You never get over it. It’s such an unbelievably big moment in your life that it never leaves you, you just learn to deal with it,” William said at the time.

PRINCESS DIANA The Prince and Princess of Wales, Prince Harry, and housemaster Dr. Andrew Gayley (behind) escort Prince William (second from right), second in line to the throne, for his first day of term at the world famous Eton College, Sept. 6, 1995. Photo: REUTERS

In another interview, Prince Harry said he went through two years of “total chaos” after he shut down his emotions for almost 20 years after losing his mother, despite his brother’s insistence that he sought help.

“My way of dealing with it was sticking my head in the sand,” Harry told the Telegraph. “Refusing to ever think about my mum because why would that help? It’s only going to make you sad. It’s not going to bring her back.”

Harry eventually took to counseling and later took up boxing to try and overcome his mental state, the report said.