The third Columbus firefighter to be investigated for alleged misconduct at Station 17 on the Hilltop denies he did anything wrong.
10TV is not identifying the firefighter in question because the investigation is ongoing, and he has not been charged with any wrongdoing.
The investigation started after a fellow firefighter reported that Columbus Police had seen a woman climbing through the window of the firehouse.
Firefighters told investigators during the same period, they'd spotted the firefighter's girlfriend's Jeep parked behind the station.
The accused firefighter denies having his girlfriend in the station after hours or having sex on the job.
The allegation came during the investigation into Firefighter Marc Cain's extramarital affair at Station 17, and the alleged failure of a Battalion Chief to do anything about it.
Columbus Fire Chief Greg Paxton has recommended Cain be terminated.
Battalion Chief Gerald Birkhimer faces administrative charges including Dishonesty, Neglect of Duty, and Insubordination.