A 71-year-old woman has been charged with murder in the Tuesday shooting death of her 60-year-old ex-husband in Anchorage.

Just before 2 a.m. Tuesday, Rita Pinkston called 911 and told police dispatchers she had shot her ex-husband, Michael Pinkston, because she was "tired of his s---," according to charging documents filed in the case Wednesday.

When officers arrived at the apartment at the 3200 block of East 41st Avenue, they found Michael Pinkston with a gunshot wound to his abdomen, the Anchorage Police Department said. Medical responders took Michael to the hospital, where he was pronounced dead a half-hour later.

Rita Pinkston, 71, was arrested at the scene and spoke with detectives at the Anchorage police station.

According to the charging documents, she told detectives that she and Michael Pinkston were married once and had divorced "decades ago," but that they still lived together, as he was her caretaker. She said they had a poor relationship and argued about domestic matters, charging documents say.

In the moments leading up to the shooting, Rita Pinkston told detectives they had been arguing.

"He was about to leave, and Rita Pinkston picked up her .40 caliber handgun, which she had next to her bed," charging documents state. "She then shot him once in the stomach. She stated she wanted to shoot him in the spine."