It took a couple or more years to find the killers in Iowa of the Pike County Massacre where six people were shot in their sleep, except for the infant and toddler. The sixteen year old had been shot multiple times since he awakened. (they had silencers), then fled to Alaska. Everyone was speculating Mexican drug cartels or the Cornbread Mafia. It turned out to be a dispute in custody of the three year old child of the mother, Hannah, and her boyfriend who pleaded guilty to avoid the death penalty, and to testify against other family members. I think one trial is still going on.
I think Ohio.
Definitely NOT Iowa, it was Ohio.