Authorities say the Indiana boy fired a single round that struck him.
Police arrested a 28-year-old Indianapolis man on a preliminary murder charge in Lt. Aaron Allan's Thursday death.
Officials say a Miller Transportation bus struck the minivan from behind about 1:45 p.m., triggering a collision involving three other vehicles.
Autum Garrett, of Huntington, Indiana, was killed, and eight people including the pregnant woman and three young children were injured in the shooting.
Police say two officers fired on 45-year-old Aaron Bailey early June 29 after he fled a traffic stop.
Wayne County Coroner Ron Stevens says an autopsy and toxicology testing are planned to determine what caused the worker's death.
Authorities say a five-year-old Cincinnati child has died after being pulled from a reservoir in eastern Indiana.
Fishers Police Officer Shawn Wynn says at least one of the two officers fired a gunshot at the man, who died at the scene Monday morning.
The Indiana Department of Natural Resources said the vehicle rolled over and ejected the Gibson County boy.
An Indiana mom began pushing for the helmet legislation after her daughter Kate Bruggenschmidt died in an ATV accident in 2015.