ROTHBURY, Mich. (AP) - Authorities have released the names, ages and hometowns of two concert goers who died while at the Rothbury music festival.

The Muskegon Chronicle and the Detroit Free Press identified them Friday as 33-year-old Staci Wagner of Waterloo, N.Y., and 28-year-old Mark Heben of Lakewood, Ohio.

They were treated by on site medics while separately attending the inaugural four-day festival at the Double JJ Ranch near Rothbury in southern Oceana County.

Both died July 6 at an area hospital.

Preliminary autopsy results show no signs of physical injury or trauma.

Michigan State Police say toxicology results for the two victims are expected in about three weeks.

Troopers say Wagner had a history of special medical needs.