TALLAHASSEE, Fla. (AP) - The Florida Supreme Court has refused to stay serial killer David Gore's execution. He is scheduled to die by lethal injection on Thursday.

The justices on Monday unanimously rejected several arguments by Gore's lawyers.

That includes their contention a recent U.S. Supreme Court decision dealing with ineffective counsel applies to his case.

The state justices ruled that opinion appears to apply only to federal rather than state court proceedings.

One of Gore's lawyers, Martin McClain, says the ruling will be appealed to the U.S. Supreme Court and that other federal court options also are being considered.

Gore is to be executed for murdering a 17-year-old girl in Indian River County nearly 30 years ago. He also is serving life terms for killing five other girls or women.