Alejandro Avila, a 30 year old factory worker — who was once tried for child molestation — was arrested as part of the California police probe into the kidnapping, rape and murder of 5 year old Samantha Runnion.  Her nude body was found dumped in the open near a rural highway in what investigators said was a calling card from the killer warning that he intends to strike again.  The cause of her death was not immediately clear but investigators believe she was sexually assaulted.  An autopsy is under way.