The shocking death of Canadian filmmaker Jean-Marc Vallée resulted from a heart attack, while at his cabin on the river outside of Quebec City, where he was preparing to receive guests the following day. So it is considered likely he passed December 25 and was found the following morning. Vallée was known as a fitness fanatic and a teetotaler, a practitioner of the Wim Hoff fitness method, which is not for the faint of heart. We will update the official cause of death when it is released. Following Deadline’s reveal of the filmmaker’s sudden passing last night, there has been an outpouring of sorrow for Vallée, everyone from Big Little Lies and Wild star Reese Witherspoon to Canadian Prime Minister Justin Trudeau. Sad day.