The question raised was who killed William Tyndale. And the answer is NOT King Henry VIII.
Tyndale was executed for heresy, after being found guilty by the Catholic Church:
http://www.tyndale.org/Reformation/1/wilkinson.html
Henry VIII had a problem with Tyndale’s and Luther’s theology, but the King “enjoyed” Tyndale’s ‘The Obedience of a Christian Man’ for obvious reasons.
If Tyndale lived after the Act of Six Articles passed (Henry VIII still held onto certain Roman Catholic dogmas), he probably would have suffered the same fate as Anne Askew and other high profile radical Protestant reformers for denying transubstantiation along with the ritual of the Mass.
That is too simple a summary. Tyndale was executed in the Low Countries after having fled England to avoid a similar fate. Heresy was considered an unacceptable secular act because all European royalty ruled by Divine Right. Any attack on the faith that they based their power upon was considered an attack on them.
"If Rome condemned highway robbery or wholesale adultery, pious Protestants would begin to think that there is a good deal to be said for them." Adrian Fortescue (martyr)
Neither Henry the VIII nor the Pope killed him.