Singer worked with the stunt co-ordinator, who lost a battle with cancer on Sunday, on 2014's "X-Men: Days of Future Past" and last year's "X-Men: Apocalypse", and the filmmaker couldn't be more devastated after learning about Trevor's passing.
In a touching tribute on his Instagram account, Singer posted an image of the stunt professional in costume standing next to his brother on set. He added the caption: "#Stuntman #TREVORHABBERSTAD (left), Son of #JeffHabberstad, my stunt cordinator (sic) over the last two #XMen films, and older brother of #ShaneHabberstad (right), passed away recently from a rare and aggressive form of cancer at the young age of 27.
"In my 20 year career I have never lost a friend/colleague this way. He and his entire family are among the kindest people I have ever met. My heart goes out to them. His passing is the very definition of the word UNFAIR. Trevor appears in a small cameo in #Xmendaysoffuturepast when #Wolverine is being pulled from the water. But his work is EVERYWHERE throughout every film he has done."
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