Have you noticed this?

[nikvoodoo]

I think her real personality is finally coming through because she's had some really funny lines lately.
Hey wait a root'n toot'n minute! Speaking of Tommy! How exactly do you think he died? Burt missed him and I was thinking that fire wouldn't kill them. He didn't get very far after all.
-Fire kill him?
-Maller kill him as he tore out the building?
Maybe I just need to listen to that episode again and just don't remember.

The Mallers were gone by the time the zombies attacked and infiltrated the building. I think it's likely that if the fall didn't kill Zom-Tom, then it's likely that he broke himself to the point he couldn't move and was burned to death.