The West Virginia State Police released new details about what happened on Friday during an attempted robbery at an Elm Grove pharmacy on Bethlehem Boulevard.
Investigators said Kevin Walnoha, 37, of Wellsburg, entered the pharmacy armed with a .45-caliber handgun wearing pantyhose over his face and a latex glove.
Police said once inside, Walnoha held two female clerks at gunpoint as he tried to rob the pharmacy.
Shortly after, investigators said, a pharmacist pulled a gun and shot him three times, killing him.
It was later determined through investigation that there was a female involved who was waiting in the vehicle outside the pharmacy.
That woman, Melody Fisher of Beech Bottom, was later identified and arrested.
She is now in the Northern Regional Jail facing a number of charges including conspiracy to commit first-degree robbery.
Investigators said at this time the pharmacist does not face any charges.
The investigation has not been completed, police said.