Her son's girlfriend was also at the home at the time of the shooting, but she was not injured.
Blessing was sharing a home with her son and his 57-year-old girlfriend in Fountain Hills, Maricopa County when the shooting happened on July 2.
"This is definitely an odd one", Maricopa County Sheriff's Office Sgt. Bryant Vanegas told the station.
The incident took place in Fountain Hills, where Blessing was living with her son and his partner. After days of deliberation, she allegedly walked into her son's room and pulled out a pistol from the pocket of her robe and shot him to death: "you took my life, so I'm taking yours". Her son was wounded and died at the scene, according to police.
"Blessing retrieved the second handgun and attempted to point it at the girlfriend, who knocked it from Blessing's possession", according to MCSO.
Blessing's son wanted her to leave for an assisted living facility because she "had become hard to live with".
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But the elderly woman had become increasingly agitated after overhearing her son talking about placing her in a nursing home because she was "too difficult" to care for, authorities said. She told police that her son wanted to send her away because she "had become hard to live with".
According to the probable cause for arrest statement, Blessing "intended to kill herself, however she didn't possess any additional firearms".
Her son's girlfriend was also in the room and said she heard Blessing telling her son she was exhausted of the way he treated her, court documents said.
Detectives are investigating this case as a domestic violence homicide and there are no suspects outstanding. 'They are often isolated and neither predictable nor preventable'. During the argument, she took one out and fired at her son.
She told deputies she had purchased one of the guns in the late 1970s and that her husband gave her the other pistol, court documents say.