No, not during a game, but players has died from injuries suffered on ice.
Professional hockey players generally spend almost every day playing hockey in some capacity. Even when they are not scheduled to play a game, regular practice sessions are required by the NHL that start in the morning and last at least an hour. Hockey players will also spend significant parts of the day performing strength training.
In the National Hockey League, 20 players are allowed to dress for a game and 23 are allowed on the 'active roster'.
A professional hockey team can have up to 23 players on its active roster, but only 20 players can dress for a game. The remaining 3 are considered healthy scratches. Most teams will usually dress 4 lines of forwards (12 players), 3 pairs of defensemen (6 players), and two goalies.
they fight to let of steam or to change the atmostsphere of a game
There are twelve players on the ice at once during a hockey game. There are six players per side, including the goaltender.
Players fighting in Olympic hockey receive a match penalty and are ejected from the game.