One NFL player has died on the field. His widow watched Damar Hamlin's collapse in horror.
The day Detroit's Chuck Hughes died at Tiger Stadium
Dick Butkus recalls Chuck Hughes' death on the NFL field in 1971 – NBC Sports Chicago
What happened to Damar Hamlin during Monday Night Football game?
Paul Sullivan: Dick Butkus personified Chicago's toughness with the Bears. 'There was no way that guy wasn't going to be great.'
Has anyone ever died due to an injury in an NFL game? - Quora
Detroit Lions, Red Wings players make list of events that stopped games like Damar Hamlin's injury
Remembering the legacy of Chuck Hughes, the only NFL player to die on-field due to a heart attack