Bills' Damar Hamlin in critical condition after collapsing on field, receiving CPR
Bills safety Damar Hamlin collapses on field after making tackle
Buffalo Bills safety Damar Hamlin in critical condition after cardiac arrest, team says – KIRO 7 News Seattle
What is commotio cordis? It could have caused Damar Hamlin to collapse : NPR
Hamlin in mind, Bills return to action with first-play TD
Damar Hamlin's On-Field Collapse Was Due to Cardiac Arrest, Bills Say - WSJ
Damar Hamlin: Buffalo Bills safety showing 'remarkable improvement,' doctors say
Damar Hamlin injury updates - Players in tears as Buffalo Bills safety collapses on field during Cincinnati Bengals game
Buffalo Bills Speak for the First Time Since Hamlin's Collapse