During his NHL career Cooke has been suspended for several much criticized hits , some involving head - shots that injured opposing players , and was an important factor influencing NHL rule changes intended to deter such conduct .
During his NHL career Cooke has been suspended for several much criticized hits , some involving head - shots that injured opposing players , most notably Marc Savard in 2010 . 
 Cooke was an important factor influencing NHL rule changes intended to deter such conduct .