Isaiah Sawn in Half?

Moreover Manasseh shed innocent blood very much,

till he had filled Jerusalem from one end to another;

2 Kings 21:16

Tradition has it that Isaiah was sawn in half by the men of wicked king Manasseh of Judah. And this was done as the old prophet Isaiah hid in a hallow tree-sawn with Isaiah inside.
This info comes from such sources as Lives of the Prophets, Babylonian Talmud and the Jerusalem Talmud.  Is this-or at least the details of it-true? I don't know----but some see Paul hinting at it -  They were stoned, they were sawn in two, they were killed with the sword... Hebrews 11:37