Connor Kasin, 17, collapsed during a charity hockey game in honor of a Syosset High School graduate killed in a car crash last year.

Bystanders performed CPR on Kasin, but he was pronounced dead at a local hospital. Kasin was a senior at Massapequa High School and a member of the Long Island Sharks under-18 hockey team. His exact cause of death remained unclear on Sunday afternoon.

A high school athlete died on Saturday during a charity ice hockey game on Long Island. Police and school officials confirmed the death of 17-year-old Connor Kasin, a Massapequa High School student who was participating in a game at the Town of Oyster Bay Skating Center in Bethpage.