The family of 15-year-old Tyler Kerr is at a loss as they question how a healthy teen could have suffered a cardiac arrest and die unexpectedly.

His uncle, Curtis Kerr, told CTV his nephew did not have any known health issues and that they have no idea why his heart suddenly stopped.

The teen died Monday morning after collapsing on the bench during a hockey game at an arena in Carp on Sunday. The game between the Richmond Royals and the West Carleton Warriors was stopped suddenly. At the time no one knew it would have such a tragic outcome.

"The coaches on the Richmond bench started yelling to stop the game, and yelling at some specific people on the spectator side to come to the bench and come to the bench right now," said hockey dad Dean Brown.

Kerr's coach and a volunteer firefighter initiated CPR and used a portable defibrillator until paramedics arrived. Kerr was rushed to the Children's Hospital of Eastern Ontario where he died.

"Your heart is breaking for kids on the team and the coaches. It's probably the most surreal and horrible thing I've ever seen in a rink before," said Brown.

The high school Kerr attended is in mourning. Officials with the Ottawa-Carleton District School Board said grief counsellors are available to students who need help coping with the loss.

"He was a good guy, very outgoing, always laughed," said student Val Bielawski.

Members of the Ottawa Paramedic Service said the response before they arrived was 100 per cent correct.

"Nobody could have done better and that probably meant this young man probably couldn't have been saved," said paramedic spokesperson J.P. Trottier.

CTV has confirmed Kerr was not hurt during the game and that he did not complain about feeling sick leading up to the collapse.

Autopsy results are pending.

With a report from CTV Ottawa's Vanessa Lee