LAWYERS -- FOR CONDEMNED KILLER RON LAFFERTY -- WANT HIS FEDERAL COURT APPEALS HALTED, SO THEY CAN FIGHT HIS PENDING EXECUTION, IN STATE COURT.

IN LEGAL FILINGS, LAFFERTY'S ATTORNEY REQUESTED THE FEDERAL DELAY... SAYING THE MURDERER STILL HAS FIVE SEPARATE STATE CLAIMS HE CAN EXHAUST, TO PROLONG HIS LIFE.

LAFFERTY WAS SENTENCED TO DIE, AFTER KILLING HIS SISTER-IN-LAW -- AND HER INFANT DAUGHTER -- IN 1984.