Casket Lyrics

There's a ghost in the mirror.
His identity becoming clearer.
There's a corpse against the wooden frame.
I fear I'm losing my mind again.

In endless hallways I'm lost again.
The box in the mirror's where I've always been.

I didn't see him upon first look.Altered Perception - Casket - http://motolyrics.com/altered-perception/casket-lyrics.html
A hero lost in the pages of a book.
My friends have all left me behind.
I'm falling farther from my own mind.

In endless hallways I'm lost again.
The box in the mirror's where I've always been.

Who's in the casket?