While the NHL lockout was in progress, Zholtok had been playing with a team in his home of Riga. He reportedly became ill during a game, collapsed and died before he could be taken to a hospital.
"We are all saddened and shocked to hear of Sergei's sudden passing," said David Poile, general manager of the Predators.
"He was a hard-working player who was liked by his teammates and coaches. We extend out deepest sympathies to the Zholtok family."