[Buckeye McFrog]

Lawyers said he had dropped out of contact.
Gone further underground or perhaps left the country.

[Dubya-M-Dees]

Or possibly shot by some beret wearing NBPP member and dragged in for his bounty.

[rogue yam]

Lawyers said he had dropped out of contact.
Gone further underground or perhaps left the country.

Or else Zimmerman simply stopped communicating with these particular lawyers for reasons of his own. Why assume more?