Chavez-Reyes, 37, is charged with obstructing justice and four other felonies for allegedly helping Roberto Miramontes Roman flee after Roman allegedly shot and killed Fox during a 1 a.m. traffic stop on Jan. 5.
Roman, 38, is charged with capital murder and two other felonies. Roman's trial won't occur any sooner than next year.
Chavez-Reyes allegedly helped Roman flee to Salt Lake City. They both were arrested Jan. 6 by officers who found them sleeping in a tool shed in Beaver.
Fox had stopped Roman's car because the vehicle was allegedly involved in a drug deal minutes earlier.
Following his arrest, Roman told police that he grew angry at being pulled over because he thought "the only reason he was stopped was he was Mexican," according to preliminary hearing testimony. When Fox walked up and demanded his license and registration, Roman pointed the barrel of an AK-47 out his driver-side window and fired, he later told police.