Buffalo defensive back Damar Hamlin was in critical condition early Tuesday after the Bills say his heart stopped following a tackle during the Monday Night Football game, which was indefinitely postponed. Hamlin collapsed on the field during the first quarter of the nationally televised game against the Cincinnati Bengals and was given medical treatment for nearly 20 minutes before being taken to a hospital. The Bills said in a statement: ``Damar Hamlin suffered a cardiac arrest following a hit in our game versus the Bengals. His heartbeat was restored on the field and he was transferred to the UC Medical Center for further testing and treatment. He is currently sedated and listed in critical condition.''