“Tyndale was certainly regarded as a heretic, but that’s not what got him killed.”
He was sentenced to death for heresy. There is a long discussion of the arguments about his beliefs here:
http://www.tyndale.org/reformj01/wilkinson.html
As soon as I read “John Foxe...” I quit. Foxe is perhaps the ugliest and most deceitful polemicist in the history of Christianity; he makes Jack Chick seem even-tempered and reasonable.
On going to close out the article, I see there is but one, single, harmless quote by Foxe, and what follows is a scholarly, respectable work of reconstructing what Tyndale believed. I skimmed it, a very lengthy work, and didn’t see much of anything about his trial. I noted that he certainly was regarded as a heretic, so I’m not sure what purpose going into his beliefs serve.