One of the guardsman who walked alongside Queen Elizabeth II’s coffin during her state funeral has died.

18-year-old Jack Burnell-Williams was found unresponsive on Wednesday, at Hyde Park Barracks in London, The Guardian reported.

READ MORE: Queen Elizabeth II Was Comforted By Her Beloved Corgis ‘In Her Final Hours,’ Says Source

“It is with sadness that we can confirm the death of Trooper Jack Burnell-Williams on 28 September 2022 at Hyde Park Barracks,” an army spokesperson told The Guardian. “Our thoughts are with the soldier’s family and friends at this difficult time and we ask that their privacy is respected.”

Burnell-Williams served with the Household Cavalry and walked with Elizabeth’s coffin from Westminster Abbey to Wellington Arch.

His death was “unexpected,” but is not being treated as suspicious.

READ MORE: Royal Family Shares Touching New Photograph Of Queen Elizabeth II Taken 5 Decades Ago

Metropolitan Police told People, “Officers will assist with preparing a report for the coroner.”

According to The Independent, the soldier’s mother shared on Facebook, “Never ever thought I would be saying this but we as a family are all heartbroken with the sudden passing of our wonderful son Jak Williams yesterday.”