An Arizona man was arrested Monday for fatally shooting his girlfriend and her wife as they sat inside their suburban Phoenix home, authorities said.

Murdoch, 29, was taken into custody in a Phoenix suburb where he was a resident, and a second woman, identified as a 21-year-old woman, was treated at a hospital.

The motive was not immediately clear.

Moss County Attorney Greg Harte said the couple, identified by police as Susan and Richard, were attending their daughter’s wedding in a suburban Phoenix suburb when a bullet pierced the front of the house.

The bullet traveled about 5 feet from the house, through a closet door and exited the house through a hole in the wall, Harte told reporters.

The couple had left for their daughter´┐Żs wedding in nearby Prescott on Friday, Harten said.

The daughter was not hurt, and Harte did not elaborate.

The incident is the second domestic-violence incident involving a bagpipe player in Arizona this year.

A couple in Payson, Ariz., died in a shooting early Friday after their 7-year old daughter shot herself in the head with a gun at the home of her boyfriend, who was sitting on the couch, authorities say.

The couple had been arguing and arguing for hours before the shooting.