CHEYENNE, Wyo. - A lawyer for a Gillette man convicted of ordering the killing of a boy who was to testify against him in a sexual assault case wants the Wyoming Supreme Court to overturn the man's murder conviction.

Kent Alan Proffit, Sr., was sentenced to life in prison on a conviction of ordering some Gillette teenagers to kill 16-year-old Bryce Chavers in 2005. Proffit later was convicted of sexually assaulting the boy.

Lawyer Tina Kerin on Monday told the state Supreme Court that Proffit didn't receive a fair trial in part because the trial judge allowed the jury to hear testimony that he had threatened Chavers before he was killed.

The Supreme Court is also considering Proffit's appeal of his sexual assault conviction and a separate appeal challenging his murder conviction in the death of another Gillette teenager.