What exactly happened that killed this rider?

Kennewick police continue to try to figure out what killed a 56-year-old Richard Green,  who was found lying in the street near Carmichael Drive and Canal.

Around 10:22pm, police received a report of what Kennewick police said was a motorcycle "collision", and Green was lying on the pavement, unresponsive.   A Kennewick police officer who arrived began to perform CPR.  Green was taken to Trios Health Care Center (Formerly KGH E.R.) where he was pronounced dead.

The accident is under investigation,  police did not specify if he was hit by another driver, or what he might have collided with.   Green was wearing a helmet, and other safety gear.