GARDEN GROVE, Calif.—Family, friends and classmates gathered for a memorial service for an Orange County high school football player who died after collapsing during a game as authorities continued investigating his death.

Seventeen-year-old Kevin Telles was remembered at a service Sunday night at a St. Columban Catholic Church in Garden Grove.

The Orange County coroner's office said Sunday that an autopsy performed Saturday was inconclusive and the investigation into what caused his death is continuing.

Telles—a senior fullback—collapsed and began convulsing on the field without taking a hit Friday night during a play with just minutes left in the game between Garden Grove High School and Westminster High School. He was later declared dead at a hospital in Huntington Beach.