Three days does not seem like a long time. But he’s been not eating or drinking. Humans can exist for several weeks without food, however after several days without water he could be suffering from a series of issues any of which could cause a coma.
doctors at the Texas prison where he is serving a life sentence induced a coma
Got that? The DOCTORS INDUCED A COMA.
He didn't drop into a coma, they didn't sedate him, they put him in a coma.
And now they are saying he might not live, hmmmm?