Buffalo Bills' player Damar Hamlin is listed in critical condition after collapsing on the football field. His heart stopped when he tackled a Cincinnati Bengals receiver during an NFL game. The entire stadium watched as team medics tried to resuscitate him. ER physician Dr. Michael Daignault says Hamlin likely suffered commotio cordis, which is a rare blunt-force trauma event that stopped his heart. Hamlin was taken to a hospital where he remains sedated. The game was later suspended.