The single-vehicle crash happened around 1:40 a.m. on the exit from southbound Interstate 75 to state Route 741, according to the Moraine Police Division.
Officers found a Honda Civic with heavy damage after it struck a pole off the side of the roadway and landed in a ditch between the exit ramp to Springboro Pike and the interstate above.
A male passenger was injured and taken to a local hospital with injuries that were not life-threatening.
Moraine Police accident investigators and the Montgomery County Coroner’s Office were called in to assist.
“While the cause of the crash is not yet known, alcohol is suspected to be a factor,” police said.
The exit ramp remained closed until 5 a.m.