A Montgomery County woman is facing a first-degree murder charge after she allegedly shot her ex-husband to death in the garage of her North Wales home.

Prosecutors on Monday said that when officers responded to the home, on the 200 block of South 6th Street, for a domestic disturbance just after 4 p.m. Sunday, they found 63-year-old Hsiu-Chin Lin sitting at the kitchen table with a .38-caliber revolver in front of her.

Lin's ex-husband, 67-year-old Chien-Kuo Lin, was lying dead in the garage with a gunshot wound to his chest, prosecutors said.

Police arrested Lin at the house.

Montgomery County Prosecutor Kevin Steele said in a news release that the investigation into the shooting so far revealed that Lin "was test firing the gun in the past week, and then fired not once but four times, fatally shooting her ex-husband once in the chest."

It's unclear what led to the deadly shooting, but police did respond for a domestic disturbance at the home. Police did not say whether the Lins had any history of domestic violence, but court records show that both faced charges -- her for fighting and him for harassment -- on the same date in November 2011. Charges for both in that case were eventually dismissed.

A Montgomery County judge denied bail in the murder case, and Lin is being held at the Montgomery County Prison. She's scheduled to appear in court for a preliminary hearing June 1.