Michael,

>> What is this sort of permanent death?? <<

First of all this is so rare that in my opinion it is something no one should be concerned about.

You will find this topic covered in much greater detail in my fourth book, Voyage to Curiosity's Father. 

Briefly, the ability to experience and express unconditional love is the glue that binds "particles of consciousness" into a coherent, self-aware being, like us.  By making choices that lead to an ever decreasing ability to experience and express unconditional love the glue binding our consciousness together dissolves.  Carry this process far enough and the coherent, self-aware being can cease to exist.  The "particles of consciousness" appear to revert to to some sort of raw unorganized state.

This is a very simplified explanation.

Bruce