Don VanMassenhoven is a National Hockey League

National Hockey League

The National Hockey League is an unincorporated not-for-profit association which operates a major professional ice hockey league of 30 franchised member clubs, of which 7 are currently located in Canada and 23 in the United States...

 referee

Official (ice hockey)

In ice hockey, an official is a person who has some responsibility in enforcing the rules and maintaining the order of the game. There are two categories of officials, on-ice officials, who are the referees and linesmen that enforce the rules during game play, and off-ice officials, who have an...

 since the 1993–94 NHL season, who wears uniform number 21.

Before he became an NHL referee, VanMassenhoven was a police officer

Police officer

A police officer is a warranted employee of a police force...

. During the 2004–05 NHL lockout, he was a car salesman in his hometown of Strathroy, Ontario.

VanMassenhoven was one of two referees (Dan O'Halloran

Dan O'Halloran

Dan O'Halloran is a National Hockey League referee, who wears uniform number 13. He was one of the selected referees who officiated the 2007 Stanley Cup Finals with Paul Devorski...

 was the other) during a November 21, 2005 game between the Nashville Predators

Nashville Predators

The Nashville Predators are a professional ice hockey team based in Nashville, Tennessee. They are members of the Central Division of the Western Conference of the National Hockey League...

 and the Detroit Red Wings

Detroit Red Wings

The Detroit Red Wings are a professional ice hockey team based in Detroit, Michigan. They are members of the Central Division of the Western Conference of the National Hockey League , and are one of the Original Six teams of the NHL, along with the Toronto Maple Leafs, Montreal Canadiens, New York...

 at the Joe Louis Arena

Joe Louis Arena

Joe Louis Arena, nicknamed The Joe and JLA is a hockey arena located at 600 Civic Center Drive in Detroit, Michigan. It is the home of the Detroit Red Wings of the National Hockey League. Completed in 1979 at a cost of $57 million, Joe Louis Arena is named after boxer and former heavyweight...

 where Jiri Fischer

Jiri Fischer

Jiří Fischer is a former professional ice hockey defenceman in the National Hockey League . Fischer went into cardiac arrest in a November 2005 game, and subsequently retired due to his heart problems...

 suddenly suffered a seizure

Seizure

An epileptic seizure, occasionally referred to as a fit, is defined as a transient symptom of "abnormal excessive or synchronous neuronal activity in the brain". The outward effect can be as dramatic as a wild thrashing movement or as mild as a brief loss of awareness...

. VanMassenhoven actually watched Fischer get revived successfully by CPR

Cardiopulmonary resuscitation

Cardiopulmonary resuscitation is an emergency procedure which is performed in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person in cardiac arrest. It is indicated in those who are unresponsive...

 and an AED

Automated external defibrillator

An automated external defibrillator or AED is a portable electronic device that automatically diagnoses the potentially life threatening cardiac arrhythmias of ventricular fibrillation and ventricular tachycardia in a patient, and is able to treat them through defibrillation, the application of...

. The game was later postponed because of what happened and was made up on January 23, 2006.