"Instead of running from the threat, she engaged with the threat and saved several lives last night," Charleston Police Department Chief of Detectives Tony Hazelett told local news WCHSTV. 

The incident occurred Wednesday when Dennis Butler,37, was angered by a group of people hosting a graduation party who told him to slow down through an apartment complex in Charleston. He returned 30 minutes later, parked his vehicle, jumped in the backseat, and discharged his weapon toward the group of 30-40 people. 

Unbeknownst to the shooter, a law-abiding citizen with a CCW was within the group and quickly drew her weapon and engaged Bulter with direct fire, fatally wounding him. 

"There was a graduation party, a party with kids," Hazelett said at a press conference. "So obviously somebody just graduated high school and another birthday party. We could have had a casualty shooting there." He estimated between 30 to 40 people attended the parties.