The reality of Jayson Tatum's devastating injury in Monday night's Game 4 loss to the New York Knicks is setting in, changing the present and the future of the Boston Celtics.

Many pro athletes and others expressed support, condolences, and more following the Celtics' star's injury in Game 4 vs. the Knicks.

Boston Celtics star Jayson Tatum appears to have suffered a serious injury in Monday's Game 4 playoff loss against the New York Knicks. Trailing the Knicks in the waning minutes of the fourth quarter, Tatum crumbled to the floor while pursuing a loose ball. He immediately grabbed at the lower part of his right leg in obvious pain.