The "I Am Cait" star shared a collage of pictures of helicopter pilot Charles T Aaron and his memorial service, whilst also sending her prayers to Charles' father Chuck, who she says has "lost his best friend".
"Sad day yesterday. My good friend Charles lost his life on Sunday. My prayers go out to his father @chuckpaaron who lost his best friend. (sic)"
Eanwhile, Chuck previously took to the photo sharing site to announce the tragic news that his son had died.