What Part Of Seed Of Chucky Did Glen Die?

The ending. Actually, I don't think he died at all.

Right at the end, just before the end credits.
You just hear him scream after Chucky`s arm grabs his neck.

We can't be sure if he died or not. No one knows for certain except the creators of the movie.

You don't really show if glen dies or not I think he doesn't honestly.