One NFL player has died on the field. His widow watched Damar Hamlin's collapse in horror.
Video: Buffalo Bills player Damar Hamlin collapses during game
Damar Hamlin - Latest news, views, gossip, photos, and video
Damar Hamlin's Collapse the 'Scariest Thing,' Say Fans Inside Stadium
Updates on Bills safety Damar Hamlin after cardiac arrest
Buffalo Bills player Damar Hamlin collapses on field during Monday Night Football game
Bills Safety Damar Hamlin Suffered Cardiac Arrest On Field, In Critical Condition
Widow of Only NFL Player to Die on Field Watched Damar Hamlin Collapse
Esther Choo, MD MPH on Twitter: We don't yet know the cause of Damar Hamlin's cardiac arrest. But vaccines are not at the top of the differential. / Twitter