Two days later, Rivera rented a tractor in his name and dug a hole in Munn's backyard. According to police, Munn told them that the equipment was used to dig a hole for an in-ground trampoline, but was later filled because the hole was the wrong size.
Flores' body was found in the same area where the hole had been dug, according to the probable cause statement.
Earlier this month, Munn pleaded guilty in a separate drug case, and the obstruction of justice charge was dismissed.
Rivera, who has prior convictions for drug distribution and escape from custody, is currently residing at the Utah State Prison in Gunnison.