Oliver "Butch" Mousseau, an NCAA hockey referee, died Friday from head injuries suffered a week earlier. He was 48.

Mousseau fell to the ice and hit his head last Friday during warmups for a Western Collegiate Hockey Association playoff game. He reportedly didn't have a helmet on and had his hands in his pockets, leaving him unable to break his fall.

Mousseau was in a medically induced coma until Friday when he suffered a brain hemorrhage, according to the Denver Post.

“We are saddened beyond belief by the tragic passing of Oliver “Butch” Mousseau,” WCHA commissioner Bill Robertson said in a statement. “Words cannot express the depth of sorrow we feel, or the sympathy the WCHA, our member institutions and fellow officials extend to Butch's wife, Macaire, their children, Sam (SJ), Abbie and Olivia, and the rest of the family. At the end of the day, hockey is just a game. It is a special game because the people involved and Butch was one of the all-time greats who left an indelibly positive impact upon everyone whom he came in contact with. The WCHA is, and always will be, a better league because of Butch's involvement.”