Pippa Middleton scales the Matterhorn in honor of her fiance's brother, who died at 22 climbing Mount Everest

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Pippa Middleton Ascends the Matterhorn to Honor Fiance's Late Brother

Pippa Middleton impressively climbed the Matterhorn in Switzerland, in honor of her fiance James Matthews' brother, Michael.

The 32-year-old younger sister of the Duchess of Cambridge reached the summit with her own brother, 29-year-old James. The climb benefited the Michael Matthews Foundation, which was set up after Matthews' brother died while scaling Mount Everest in 1999. Michael was just 22 years old.

"It was humbling to have been able to climb one of the world's most beautiful mountains and raise money for a charity created in memory of an extraordinary young man who lost his life on another peak," Pippa told The Mail on Sunday. "Although I have raised money in the past for the Michael Matthews Foundation, it has now become even more important to me and my family."

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"Although neither I nor my brother ever met Michael, we both share his spirit and passion for the mountains," she added. "We made this climb knowing he would have been there nudging us on, and we are honored to be supporting his memory."

See photos of Pippa Middleton through the years:

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LONDON, ENGLAND - JULY 18: Pippa Middleton and Princess Eugenie attend The Frost family final Summer Party to raise money for the Miles Frost Fund in partnership with the British Heart Foundation on July 18, 2016 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images for British Heart Foundation)
LONDON, ENGLAND - JULY 08: James Middleton and Pippa Middleton attend day eleven of the Wimbledon Tennis Championships at Wimbledon on July 08, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 08: James Middleton and Pippa Middleton attend day eleven of the Wimbledon Tennis Championships at Wimbledon on July 08, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 04: Pippa Middleton seen arriving at Day 8 of Wimbledon on July 4, 2016 in London, England. (Photo by Neil Mockford/GC Images)
LONDON, ENGLAND - APRIL 28: Pippa Middleton attends Disability Snowsport UK ParaSnowBall 2016 sponsored by Crystal Ski Holidays and Salomon, at The Hurlingham Club on April 28, 2016 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images for Disability Snow Sports UK)
LILLEHAMMER, NORWAY - MARCH 19: Pippa Middleton attends Birkenbeinerrennet ski race on March 19, 2016 in Lillehammer, Norway. (Photo by Ragnar Singsaas/WireImage)
LONDON, ENGLAND - FEBRUARY 11: Pippa Middleton attends the British Heart Foundation: Roll Out The Red Ball at The Savoy Hotel on February 11, 2016 in London, England. (Photo by Danny Martindale/WireImage)
KING'S LYNN, UNITED KINGDOM - JANUARY 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Pippa Middleton attends the Sunday service at St Mary Magdalene Church, Sandringham on January 10, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)
FILE - In this Saturday, Feb. 26, 2011 file photo, Pippa Middleton, sister of Kate Middleton, as she arrives at the wedding of the Duke and Duchess of Northumberland's eldest daughter Lady Katie Percy to city financier Patrick Valentine at St Michael's Church in Alnwick, England. Pippa Middleton, the sister of Kate will be maid of honour at the wedding of Britain's Prince William and Kate Middleton on April 29, 2011. (AP Photo/Scott Heppell, File)
LONDON, ENGLAND - APRIL 28: Catherine Middleton (R) her mother Carole and sister Pippa arrives at The Goring Hotel after visiting Westminster Abbey on April 28, 2011 in London, England. With less than 24 hours to go final preparations for the wedding of Prince William and Catherine Middleton are in place. (Photo by Christopher Furlong/Getty Images)
LONDON, ENGLAND - APRIL 29: Sister of the bride and Maid of Honour Pippa Middleton arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Pascal Le Segretain/Getty Images)
LONDON, ENGLAND - APRIL 29: Maid of Honour Pippa Middleton with brides maids and page boy make the journey by carriage procession to Buckingham Palace following their marriage at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Peter Jordan - WPA Pool/Getty Images)
LONDON, ENGLAND - JUNE 09: Pippa Middleton watches the Men's Singles third round match between Andy Roddick of the United States and Kevin Anderson of South Africa on day four of the AEGON Championships at Queens Club on June 9, 2011 in London, England. (Photo by Clive Brunskill/Getty Images)
Kate, Duchess of Cambridge, right, speaks with her sister Pippa Middleton to watch Roger Federer of Switzerland face Andy Murray of Britain during the men's final match at the All England Lawn Tennis Championships at Wimbledon, England, Sunday, July 8, 2012. (AP Photo/Kirsty Wigglesworth)
NEW YORK, NY - SEPTEMBER 05: Pippa Middleton attends Day Ten of the 2012 US Open at USTA Billie Jean King National Tennis Center on September 5, 2012 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)
Pippa Middleton poses at Shadowdance Premiere at Cineworld Haymarket on Monday August 13, 2012 in London. (Photo by Jon Furniss/Invision/AP)
Pippa Middleton, sister to the Duchess of Cambridge, formerly known as Kate Middleton, poses for the media as she arrives at a bookshop to promote her new book "Celebrate: A Year of British festivities for families and friends", in London Thursday, Oct. 25, 2012. (AP Photo/Kirsty Wigglesworth)
LONDON, UNITED KINGDOM - OCTOBER 25: (EXCLUSIVE COVERAGE) Pippa Middleton launches her new creative entertaining book 'Celebrate: A Year Of Festivities For Family and Friends' at an afternoon children's hallowen party held at Daunt Books, Fulham Road on October 25, 2012 in London, United Kingdom. (Photo by David Levenson/Getty Images)
Pippa Middleton watches Czech Tomas Berdych play against Switzerland's Roger Federer during their 2012 US Open men's singles quarterfinal match at the USTA Billie Jean King National Tennis Center in New York on September 5, 2012. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/GettyImages)
ALNWICK, UNITED KINGDOM - JUNE 22: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Pippa Middleton attends the wedding of Lady Melissa Percy and Thomas Van Straubenzee at St Michael's Church on June 22, 2013 in Alnwick, England. (Photo by Max Mumby/Indigo/Getty Images)
CHELTENHAM, ENGLAND - MARCH 14: Pippa Middleton attends the third day of the Cheltenham Festival, at Cheltenham Racecourse on March 14, 2013 in Cheltenham, England. (Photo by Julian Parker/UK Press via Getty Images)
Pippa Middleton arrives at the wedding of James Meade and Lady Laura Marsham, at Gayton Church in Gayton, Norfolk, Saturday, Sept 14, 2013. (Photo by Joel Ryan/Invision/AP)
LONDON, ENGLAND - JUNE 24: Pippa Middleton and James Middleton watch the Gentlemen's Singles first round match between Andy Murray of Great Britain and Benjamin Becker of Germany on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - NOVEMBER 20: Pippa Middleton attends the Sugarplum Ball at One Mayfair on November 20, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images)
Party planner Pippa Middleton promotes the Dutch edition of her book 'Celebrate: A Year of British Festivities for Families and Friends' in a bookstore in Haarlem. Kate Middleton's younger sister Pippa describes her stardom -- and the attention paid to her behind -- after last year's royal wedding as 'startling', in a book to be released in October. AFP PHOTO / ANP / KIPPA ROBIN VAN LONKHUIJSEN netherlands out - (Photo credit should read ROBIN VAN LONKHUIJSEN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 21: In this handout image provided by the Boodles Boxing Ball Committee, Pippa Middleton attends the Boodles Boxing Ball 2013 on September 21, 2013 at the Grosvenor House in London,England. (Photo by Dominic O'Neill/Boodles Boxing Ball Committee via Getty Images)
LONDON, UNITED KINGDOM - JULY 11: Pippa Middleton and James Middleton in the royal box during the Coronation Festival Evening Gala at Buckingham Palace on July 11, 2013 in London, England. (Photo by Dominic Lipinski-WPA Pool/Getty Images)
Pippa Middleton arrives for the GQ Men Of The Year Awards 2014 at a central London venue, London, Tuesday, Sept. 2, 2014. (Photo by Jonathan Short/Invision/AP)
Pippa Middleton seen out in Chelsea, 11 September 2014. 11 September 2014. 11 September 2014. Vantage News/IPx
LONDON, ENGLAND - MARCH 13: Pippa Middleton attends a memorial service for Sir David Frost at Westminster Abbey on March 13, 2014 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JUNE 10: Pippa Middleton attends day two of the Aegon Championships at Queens Club on June 10, 2014 in London, England. (Photo by Matthew Stockman/Getty Images)
LONDON, ENGLAND - FEBRUARY 10: Pippa Middleton attends the British Heart Foundations Roll Out The Red Ball at Park Lane Hotel on February 10, 2015 in London, England. (Photo by Tim P. Whitby/Getty Images)
LONDON, ENGLAND - MARCH 18: Pippa Middleton leaves The Cumberland Hotel after attending a fundraising ball for Disability SnowSport UK on March 18, 2015 in London, England. (Photo by Keith Hewitt/GC Images)
BRIGHTON, ENGLAND - JUNE 21: Pippa Middleton Finishes the London To Brighton Bike Ride For British Heart Foundation on June 21, 2015 in Brighton, England. (Photo by Anthony Harvey/Getty Images)
LONDON, ENGLAND - MARCH 31: Pippa Middleton attends as Spectator Life magazine celebrates its third birthday at the Belgraves Hotel on March 31, 2015 in London, England. (Photo by David M. Benett/Getty Images)
LONDON, ENGLAND - JULY 09: Pippa Middleton attends day ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 9, 2015 in London, England. (Photo by Shaun Botterill/Getty Images)
KING'S LYNN, ENGLAND - JULY 05: Pippa Middleton arrives at the Church of St Mary Magdalene on the Sandringham Estate for the Christening of Princess Charlotte of Cambridge on July 5, 2015 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JULY 18: Pippa Middleton attends The Frost family final Summer Party to raise money for the Miles Frost Fund in partnership with the British Heart Foundation on July 18, 2016 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images for British Heart Foundation)
LONDON, ENGLAND - SEPTEMBER 12: Pippa Middleton attends the Boodles Boxing Ball at The Grosvenor House Hotel on September 12, 2015 in London, England. (Photo by Eamonn M. McCormack/Getty Images)
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Pippa shared that her fiance didn't climb the mountain alongside with her, as the memories of his younger brother's death are still devastating.

"It would have been good if my fiance James had been here to share the experience, something I know he would have loved to have done. Mountain climbing, though, has disturbing memories and understandably James kept his feet firmly on the ground, while giving us his complete support," she explained.

The Michael Matthews Foundation helps to provide an education to children in remote places.

Pippa is no stranger to daring climbs. She scaled Mont Blanc in 2008, again, alongside her brother.

See photos of Pippa Middleton and her fiance:

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LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
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WATCH: Newly Engaged Pippa Middleton Can't Stop Smiling as She Jogs Through London

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