Sources reveal Jean-Marc Vallée’s cause of death over Christmas.

Vallée, the director of “Dallas Buyers Club,” is suspected of having died of a heart attack in a cabin outside of Quebec City, Canada.

Vallée was reportedly prepared to receive guests over the weekend. He most likely died on Dec. 25 and was discovered the following day.

On Monday, Dec. 27, condolences were sent to the director. Many celebrities have mourned the passing of their friend.

“Spy” director Paul Feig wrote, “My god, this is so unbelievably sad. What a huge loss. He was an incredibly talented filmmaker. Sending much love and condolences to his family. #RIPJeanMarc.”

Shailene Woodley and Reese Witherspoon, stars of “Big Little Lies,” also paid tribute.

“I am in shock. Complete and utter shock,” wrote Woodley.

“My heart is broken. My friend. I love you.” Witherspoon tweeted.

“Jean-Marc Vallée’s passion for filmmaking and storytelling was unmatched—so too was his talent. Through his work and with his art, he left a mark in Quebec, across Canada, and around the world. My thoughts are with his family, friends, and fans as they mourn his sudden passing,” Canadian Prime Minister Justin Trudeau wrote according to the New York Post.

Vallée was a health enthusiast. He avoided alcohol, worked out daily, and used Wim Hof’s extreme breathing techniques.

The filmmaker and producer won an Emmy Award for directing HBO’s popular series “Big Little Lies”. His 2013 TV series “Dallas Buyers Club,” received many Academy Award nominations.

As USA Today reported, Vallée used natural light and a handheld camera during filming. He also allows the actors to improvise scripts and change the scene’s setting.

He is survived by his two sons, Alex and Émile, and three siblings.

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