When Buffalo Bills safety Damar Hamlin collapsed, seemingly lifeless, on Monday Night Football in January: the world stood still. But somewhere on Long Island, New York, one mother watched everything unfold knowingly, fully aware of what had happened to Hamlin. Because the cause of Hamlin’s collapse was the same condition – Commotio Cordis – that had taken her son’s life 23 years earlier.

So today, Tisha Thompson shares the story of a decades-long mission that grew from that loss, which has saved hundreds of lives, including Damar Hamlin.

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