The incident was reported shortly before 2:30 p.m. Friday in the 3000 block of Stoney Creek Road in East Norriton.
Details are sketchy, but police have confirmed to Action News that the discharge struck the trooper’s pregnant wife.
The woman was transported to Mercy Suburban Hospital where she was later pronounced dead.
Action News has learned that the victim previously worked for the state police as a civilian employee.
State police say the woman’s husband is a seven-year veteran of the force operating out of the Skippack barracks.
So far it is unclear who was handling the weapon at the time of the discharge.
Montgomery County detectives are on the scene assisting the East Norriton Police with the investigation.