Comedian Jung Se-hyup, beloved internationally for his “Chow Chow” dog character, has passed away suddenly.

The 41-year-old, who had recently overcome leukemia, died Monday night, according to Korea’s Maeil Business Newspaper.

“The exact cause of death is not yet confirmed, but it is unrelated to leukemia and is presumed to be cardiac arrest,” the Korea Broadcasting Comedians Association said, per the outlet.

According to Soompi, acquaintances and industry sources reported that Jung Se-hyup was with a friend when he suddenly experienced chest pain and had trouble breathing. He was rushed to a nearby emergency room but ultimately passed away.

“After arriving at the emergency room, he was talking to the doctor when he suddenly suffered cardiac arrest,” a friend of the comedian explained,

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