Thacker, 42, of Chouteau, stabbed all of his victims to death.
According to Oklahoma and Tennessee prison records, Thacker is currently incarcerated in Tennessee.
The Supreme Court on Monday also rejected an appeal from Jackie Lynn Petty, of Midwest City, who was convicted of first-degree murder for killing his brother in 2005.
Petty, 59, is serving a life sentence for the crime; he claimed at his trial that he shot his brother in self-defense, but prosecutors contended there was no credible evidence of that.
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