Extradition proceedings for nine members of the Ervil LeBaron polygamist family have been postponed until next Monday.

The family members were arrested Feb. 14 after a North Lake, Ill., police officer pulled over a truck bearing expired Georgia license plates.Among those arrested was Aaron LeBaron, 20, a son of the late Ervil LeBaron, who died in Utah State Prison while serving time for murdering a rival polygamist leader in 1977.

Aaron LeBaron is the prime suspect in the slaying of polygamist leader Daniel Ben Jordan, who was gunned down Oct. 16, 1987, at a deer hunting party on National Forest land near Manti, Utah.

Warrants out of U.S. District Court in Utah command Aaron LeBaron and several other family members to appear before a federal grand jury investigating the Jordan homicide.

Hearings originally scheduled Monday before U.S. Magistrate Elaine E. Bucklo, North District of Illinois, were continued until next Monday at the defendants' request, said assistant U.S. attorney Dan Gillogly.