In the words of the legendary Paul Harvey "It's not one world".

Police say that Jeremiah Lee Wright, 30, decapitated his special-needs son and placed the boy's head near the street, with the intention of making sure the boy's mother saw it when she returned home.  

A passing motorist saw it first, alerted police, and saved the mother from the horror of the discovery.

KATC TV3 has this report.