How will they die?

Wikipedia does a nice job with this:

On February 16, 2004, during a Vancouver-Colorado game, Moore injured Canucks team captain Markus Näslund by checking him in the head area while Näslund was over extending for a puck ahead of him with his head down. No penalty was called on the play, but Näslund suffered a concussion and a bone chip in his elbow as a result of the hit, and missed three games. Moore’s hit on Näslund drew much criticism from the Canucks and their fans, but the NHL ruled that the hit was not illegal and did not fine or suspend Moore. Canucks head coach Marc Crawford and general manager Brian Burke publicly criticized the non-call by the referees on the incident. Vancouver players indicated that they would get even with Moore, with left winger Brad May stating that he would put a bounty on Moore’s head.

During the next game between the Canucks and Avalanche held in Denver, NHL commissioner Gary Bettman and NHL executive vice-president Colin Campbell attended the game, which ended in a tie and saw no major incidents break out.

However, on March 8, 2004, during another rematch between the Avalanche and Canucks, things went differently. In the first period, Moore fought Vancouver player Matt Cooke in a fairly even brawl, and served the 5-minute penalty for fighting. The Avalanche would go on to build up a large lead in a fight-filled game. Late in the third period, Todd Bertuzzi was sent onto the ice. After failing to instigate Moore to fight, Bertuzzi skated after him for a long period before punching Moore in the head from behind and falling upon him along with several other players from both teams. Moore’s head was driven into the ice during the fall, causing three fractured neck vertebrae, facial cuts and a concussion. Many believe that it was Bertuzzi who broke Moore’s neck, despite the fact that there were several other players on top of both players. Moore was knocked out, and lay motionless for ten minutes before being carried off on a stretcher.