By Tom Brown

SANFORD, Florida (Reuters) - The lawyers representing George Zimmerman, the neighborhood watch volunteer who shot and killed unarmed teenager Trayvon Martin but has not been arrested, on Tuesday said they have withdrawn from the case after losing contact with Zimmerman.

Attorneys Craig Sonner and Hal Uhrig said they were concerned that Zimmerman had telephoned the special prosecutor probing the case directly, set up a legal defense fund website and may have spoken with Fox Television commentator Sean Hannity, all without their knowledge.

"We have lost contact with him," attorney Craig Sonner said at a press conference outside the Seminole County Courthouse.

(Reporting By Dan Trotta in New York and Tom Brown in Sanford, Florida; editing by Dan Burns)