What happened to Val Kilmer's character?

Rating: 9/10 (3 May 2005)

I've just watched the new DVD of this film and the thing that struck me was what happened to Val Kilmer's character? The last we see of him was him driving him away from his wive's house after the cops let him go thinking he was someone else. He was pretty badly wounded in the shoot out but seemed to make a pretty amazing recovery.
If he did survive then maybe there is a chance of Heat 2. With both Kilmer and Pacino returning. A long shot but I think they could make a good sequel. Kilmer could comeback looking for revenge for the killer of the De Niro character. Might be better to film it somewhere like Miami this time.