A South Carolina gun store owner faces an involuntary manslaughter charge after police say he shot a worker in the face in an attempted prank. Coastal Firearms owner Jon Whitley was arrested Monday on the charge nearly a month after the death of Stefan Mrgan. News outlets report that authorities found Mrgan inside the store's lobby with a gunshot wound to his lower face on Nov. 2. A police affidavit states Whitley placed a replica Glock BB gun among real firearms in the store with the intent of pranking Mrgan. The Berkeley County Sheriff's Office says Whitley mistakenly picked up and fired a real gun at Mrgan instead.