Ex-NHL player Konstantin Koltsov -- the boyfriend of tennis star Aryna Sabalenka -- has died.
The hockey player's former club in Russia, Salavat Yulaev, announced the heartbreaking news Tuesday ... though further details surrounding his death were not made immediately available.
"He was a strong and cheerful person," Salavat Yulaev officials said, "he was loved and respected by players, colleagues, and fans. Konstantin Evgenievich forever wrote himself into the history of our club."
"May he rest in peace.