Who is Damar Hamlin, and what happened to him?
In photos: Buffalo Bills' Damar Hamlin suffers cardiac arrest on Monday Night Football - All Photos
Buffalo Bills safety Damar Hamlin in critical condition after collapse on field
Ex-Eagles WR who suffered cardiac arrest like Bills' Damar Hamlin: 'It was dirty for them to cut me'
Buffalo Bills' Damar Hamlin critical after collapse on field - WHYY
Bills Game Against Bengals Will Not Be Resumed After Damar Hamlin Collapse
Bills' Damar Hamlin suffers cardiac arrest on field: Safety shows 'remarkable improvement;' Biden reaches out
Damar Hamlin at Bills OTA's, participating in on-field individual drills
Bills' Damar Hamlin in critical condition for cardiac arrest - Los Angeles Times
Bills' Damar Hamlin OK to play after suffering cardiac arrest - ESPN
Bills safety Damar Hamlin returns to action in first regular-season game since cardiac arrest
Shocking scene as Bills player Damar Hamlin suffers cardiac arrest at NFL game
Damar Hamlin shows 'signs of improvement' while still in ICU in critical condition, Bills say, after mid-game cardiac arrest