Shawn McGuire was sentenced to 105 to 125 years in prison for murder and two other convictions. Authorities say McGuire was the getaway driver in the killing of 36-year-old Cesar Sanchez-Gonzalez, who was a government drug informant.

In his appeal McGuire alleged several errors by the trial court. Among them, he said the trial judge's should not have accepted McGuire's waiver of conflict of interest after his former lawyer began working for the prosecutor's office.

The high court disagreed in its ruling issued Friday, saying there is no evidence to show district court's decision to accept the waiver was erroneous.