This appears to be a strange mash-up of vague spirituality, astral projection and Christian cosmology. I don't believe Swiffs that you're entirely clear on what you're talking about; and I don't believe that the person who told you any of this is either.
"Third Heaven", in some Judeo-Christian beliefs, is a "section" of Heaven, where God is supposed to call his own, shall we say. I don't know where you got these ideas that you can meditate up to such a point where you can travel to it, and then die there? Terribly confusing ideas. Then again, the idea of Heaven itself confuses me, so there we go.
I recommend you try to find the source of whatever it was you read, or saw, that suggested this idea to you. It might help to re-read it, as you seem to be missing some information out potentially. Otherwise, I'd throw the idea out; it simply sounds like a mish-mash of ideas, that may or may not be true.