Remember that episode, the one where a guy was giving makeup to young women.  He was a delivery driver.  He drove a red delivery vehicle.  He travels around, so he could be able to travel for murders.  Also his schedule is flexible.  He has time to kill, while people are set on a schedule.  The guy was the creepiest, most suspicious suspect I ever seen the CBI interrogate.  He may have not murdered that girl, but he looked extremely guilty.  Rulon Farnes first appeared in the episode Redwood.