(Kelso, WA)  --  Kelso Police are investigating a murder-suicide that happened Friday night.  Police say the incident started with a shooting from one vehicle at a another.  Both vehicles stopped in a convenience store parking lot.  Witnesses say 60-year-old Scott Belensky shot and killed 31-year-old Brittany Thuney and then killed himself.  Belenski was the biological grandfather of Thuney's seven-year-old child, who had just been dropped off with Belenski's son.  The child has been turned over to Thuney's family.