The Supreme Court, without comment, declined Monday to hear Thacker's federal appeal, which claimed that his attorneys wrongly allowed him to plead guilty to Hill's murder and that the sentencing judge did not weigh evidence of Thacker's bi-polar disorder. The 10th U.S. Circuit Court of Appeals confirmed his sentence last April.
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.