The cause of Jean-Marc ValléeShared the news of a sudden death. 

It Big Little Lies director died at the age of 58 on Christmas Day in Quebec from “a fatal cardiac arrhythmia secondary to severe coronary atherosclerosis,” according to a family statement explaining the coroner’s report, obtained by Deadline.

The Center for Disease Control and Prevention states that coronary atherosclerosis or coronary artery disease is a common type of heart disease. This happens when plaque builds-up on the walls. The disease blocks blood flow to the heart and can result in a cardiac arrhythmia, or an irregular heartbeat, which can be fatal.

On April 13, Vallée’s sons Alex29 and Émile, 25, showed appreciation for the director’s fans, saying in a statement that they have received lots of messages about Vallée’s “friendship, esteem and respect.”

The two shared that they were deeply grateful for his creative contributions and that they hoped that their creativity would continue to inspire and guide people working in the same industry he loved.