Red Wings forward Tyler Bertuzzi will have a hearing with the Department of Player Safety for roughing/unsportsmanlike conduct.
The incident took place on Sunday night, halfway through the third period while Colorado led 1-0. After Matt Calvert was hit into the Detroit bench, his stick was held by a few players. Calvert tried to skate away, but was soon sucker-punched by Bertuzzi, who had taken his glove off.
The league hinted they would take a look at this incident that same night and formally announced it Monday morning.
Update, 7 PM: Bertuzzi has been suspended for two games.