Rusty, but this seems to have the opposite meaning.
"Morir en vida", as far as I understand it in Spanish is like "enterrarse en vida", as in "Retirarse del trato con los demás." or "suffer in life, as if one was already dead"...
https://elvuelodelalechuza.com/2018/...idad-de-crear/
https://books.google.com/books?id=40...ida%22&f=false
"I am in Heaven", is close, in my view, to "I am in Cloud 9" or some such.
Am I off the mark here?