Young and up-and-coming motocross star Aidan Zingg died after suffering a traumatic heart injury during a mid-race crash ... a coroner's report, obtained by TMZ Sports, states.
Zingg sustained the fatal wound while racing in the 2025 Mammoth Motocross event in Mammoth Lakes, Calif. back on June 28.
It's unclear exactly how Zingg wrecked his bike, but the coroner's report states the teen was found "face down" by medics ... and "unresponsive with no pulse and not breathing.