Copley Township Police Chief Michael Mier says 16-year-old Amelia Shambaugh was visiting a friend when they were both killed in the rampage.
Police say Shambaugh and 16-year-old Autumn Johnson were killed in car parked outside the house of Autumn's grandparents, who were also killed.
Mier says federal authorities are tracing two handguns linked to shooter Michael Hance, who died in a gunfight with police after killing seven people.
Mier says he still doesn't know why Hance did it.
Neighbors and family friends say a dispute over the house where Hance and his girlfriend lived may have been a factor.
Information from: WKYC-TV
