A former western Illinois prosecutor accused of killing his wife now has a different legal problem: A $35,000 bill he claims is unconstitutional. Curtis Lovelace, a former Adams County assistant state’s attorney, argues the bail bond forfeiture he paid even after a jury acquitted him of murder violates the U.S. Constitution’s due process, equal protection and excessive fines clauses.His arguments are now being vetted by the nation’s top court. Attorneys for Lovelace, who faced two trials for the 2006 death of his wife and …