NHL veteran Sergei Zholtok collapses and dies at end of hockey &lt;b&gt;...&lt;/b&gt; (CP) - Veteran NHL player Sergei Zholtok died Wednesday of an apparent heart ailment. He was 31. Zholtok was playing hockey fsor the club team in his home city of Riga, the Latvian capital, when he became ill near the end of a game.