A 60-year-old man in Arizona was arrested for allegedly killing his wife and mother-in-law barely a week after his wife filed for a divorce.

Richard McGrath was taken into custody on Tuesday and charged with two counts of premeditated first-degree murder, two counts of aggravated assault, two counts of kidnapping, and one count each of armed robbery and burglary in the slayings of 53-year-old Marcia McGrath and 77-year-old Thea Merlino, records reviewed by Law&Crime show.

According to a probable cause affidavit, deputies with the Maricopa County Sheriff’s Office at about 3:07 a.m. on Tuesday responded to an emergency call regarding an armed male at an apartment complex in the area of 111th Avenue and Newcastle Drive.

The complainant told the emergency dispatcher that they and another person heard a “loud banging noise” from the apartment upstairs and were worried that someone may have fallen down.

“The complainants grabbed their cell phone and began walking up the stairs to the second story apartment to do a welfare check when they noticed the front door of the upstairs apartment was open,” the affidavit states. “Around that same time, a white male subject wearing all dark clothing and gloves appeared from the apartment with the open door, and was holding a black handgun.”

The armed man — who investigators later identified as Richard McGrath — ordered the complainants to lay down on the ground, threatening to shoot them if they moved. The gunman then took a cellphone from one of the complainants.

When the gunman reentered the apartment, the complainants ran back down to their apartment and called 911. As they were retreating, the gunman threatened to kill them again, per the complaint.

Upon arriving at the scene, first responders said they found the front door of the women’s apartment unit already opened. Inside, they discovered two adult females — later identified as Marcia McGrath and Thea Merlino — suffering from what appeared to be gunshot wounds. Merlino was pronounced dead at the scene, but her daughter was still alive when authorities arrived and fingered her husband as the man who pulled the trigger.

“Prior to this female dying, (Marcia McGrath) made statements to MCSO deputies while they were providing medical attention to her on scene that her ex-husband ‘Robert McGrath’ was the suspect who shot her,” the affidavit states. “She continued to state, ‘I’m divorced’ and ‘he lives in El Mirage.’”

Marcia McGrath was pronounced dead a short time after she arrived at a hospital.

When deputies went to question Robert McGrath at his home in El Mirage, they allegedly found bullets of the same caliber used to kill his wife and mother-in-law. During the interview, detectives said McGrath told them “about being prescribed sleep medication and at the time of the interview, being under the effects of the prescribed sleep medication.”

He was arrested at his home and transported to Maricopa County Jail where he is currently being held on $2 million cash-only bond. He is currently scheduled to appear in court on July 5.

According to a report from Phoenix CBS affiliate KTVK, Marcia McGrath on June 17 filed for divorce from her husband.