From Sports Illustrated -

Buffalo Bills safety Damar Hamlin, who is in critical condition following a scary on-field injury against the Cincinnati Bengals Monday night, has normal vitals has but been put on a breathing tube, per a statement from Hamlin's marketing rep, Jordan Rooney.

Rooney took to Twitter after Monday's game was postponed to update fans on Hamlin's status.

Update on Damar:

His vitals are back to normal and they have put him to sleep to put a breathing tube down his throat. They are currently running tests.

We will provide updates as we have them.