Cause of Damar Hamlin’s Cardiac Arrest Still Not Clear, Doctor Says

First thing Buffalo Bills safety asked is if Bills won the game

Siran Neal #33 of the Buffalo Bills reacts after teammate Damar Hamlin #3 was injured against the Cincinnati Bengals during the first quarter at Paycor Stadium in Cincinnati, Ohio, on Jan. 2, 2023. Kirk Irwin/Getty Images

Doctors with the University of Cincinnati Medical Center said tests are ongoing to determine the cause of Buffalo Bills player Damar Hamlin’s cardiac arrest during Monday night’s game.

A “workup is ongoing,” William Knight, lead physician and professor of emergency medicine at UC Health, said in a news conference Thursday. “We do not have definitive answers as to the etiology of the arrest, and tests will continue to progress.”