YUMA, AZ - A man already serving a life prison sentence for a 2007 murder has been accused of killing six people in Yuma two years earlier.
Preston Alton Strong has been indicted by a Yuma County grand jury on six counts of first-degree murder and one count each of robbery and burglary.
Police say a 29-year-old woman and her four children ranging in age from 6 to 13 were found dead inside a Yuma house on June 24, 2005.
A 35-year-old man also was found with multiple gunshot wounds in the home's backyard and later died at a Yuma hospital.
Police say witnesses reported seeing a man walking back into the house after the shooting.
Strong is serving a life prison term with no chance for release for killing a Yuma physician.