Collapse of Bills safety Damar Hamlin demonstrates the importance of knowing CPR
Who Is Denny Kellington, the Assistant Athletic Trainer Who Administered Life-Saving CPR to Damar Hamlin? – NBC Chicago
Buffalo Bills trainer, OSU graduate credited with saving Damar Hamlin's life
Bills' Assistant Trainer Praised for Damar Hamlin's Quick CPR Response - Sports Illustrated
Bills trainers: Learn from Hamlin case
Bills trainer Denny Kellington, who helped save Damar Hamlin, speaks at Oklahoma State graduation
Damar Hamlin timeline from injury to return to Bills, National Sports
Bills trainer who performed CPR on Damar Hamlin says he isn't a hero, but 'I was ready'
Athletic trainer who saved life returning for OSU commencement
I was ready': Bills athletic trainer speaks at OSU spring commencement ceremonies, News
Bills' trainer who helped save player's life speaks at OSU
Bills training staff who helped save Damar Hamlin to receive ESPYs award - A to Z Sports
Hamlin makes NFL regular-season return after cardiac arrest, National News