August 31, 2017 01:55 PM

At the height of the AIDS epidemic in 1987  Princess Diana did something truly remarkable: She shook hands with an AIDS patient in London, a simple act that reverberated around the globe and smashed stigmas at a time when public fears about catching the disease were prevalent.

To her brother Charles, 9th Earl Spencer, it was not a surprise. “She was not really a gloves person,” he tells PEOPLE in last month’s cover story.

“She was very real and very about human contact,” he says. “And what really mattered that day was to get across a very clear message that, ‘I’m going to touch this gentleman — and you can all exist in a community with people who are suffering, and we must help.”

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Today her sons Prince William and Prince Harry have carried on the mantle of her work of breaking down barriers toward public health, with Harry recently taking an HIV test alongside Grammy winner Rihanna.

Sharon Smith, a manager at London’s Mildmay hospital recalls the many times Diana would come to visit patients – often in secret. “She’d ring up and say, ‘I’ll be along this evening, no cameras, it’s a private visit.’ She’d just come in jeans, jacket, baseball cap or from a dinner or a gala in all her finery and have a cup of tea to see the patients.”

Visiting New York in 1988, Diana headed to a children’s hospital in Harlem where she met staff including Dr. Margaret Heagarty.

“When she picked this little boy up, she said ‘Oh you’re as heavy as Harry!'” recalls Heagarty. “Here she was, this impeccably dressed woman who was beautiful beyond belief, holding an infant with AIDS.”

RELATED VIDEO: Remembering Princess Diana on the 20th Anniversary of Her Tragic Death

Another key cause later in Diana’s life was tackling the lethal landmines that littered war zones in Angola, Africa and the former Yugoslavia.

Jerry White, CEO of Global Impact Strategies, and Ken Rutherford journeyed with Diana to Bosnia in August 1997 – her last humanitarian tour.

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White appears alongside Spencer and other friends and confidants in a two-night television event from PEOPLE and ABC, The Story of Diana, airing on ABC Aug. 9 and 10 at 9 p.m. E.T.

“I saw how she had this eye for suffering,” he recalls. “She used to say to me, ‘Jerry, you have to care enough to show up first and foremost.’ A father was showing his stump and his scars. But Diana would reach out, unintimidated, and touch. In another case, with a young 16-year-old girl who was  missing a limb, she’d touch her necklace, just little gestures showing that Diana was paying attention.”

He adds, “I’ve had the privilege of working with leaders all around the world. I’ve never experienced this charismatic light energetically coming off of someone. And, actually, changing things.”

 For full PEOPLE coverage of the 20th anniversary of Princess Diana’s death:
•PEOPLE’s special edition Diana: Her Life and Legacy is available now
Princess Diana: Behind the Headlines is streaming on the new People/Entertainment Weekly Network (PEN). Go to, or download the PEN app on your favorite mobile or connected TV device

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