An 83-year-old Gatineau, Que., man has been charged with second-degree murder in the Monday night shooting death of his wife.

Police in Gatineau, Que., are investigating the city's first homicide of 2012 after Santina Larosa, 76, died from gunshot wounds.

Police said a man called 911 at about 7:40 p.m. claiming a woman was dead at 52 Rivermead Way in the Aylmer sector.

Officers found Larosa had been shot, and they immediately arrested her husband, Domenico Torrente.

Torrente is in hospital under police surveillance.

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Gatineau police are investigating the city's first homicide of 2012 after an elderly woman died from gunshot wounds. (CBC)

Police said they believe the incident was the result of domestic violence, and not a mercy killing, but continue to investigate.

An autopsy is scheduled in Montreal, the results of which will be announced later this week.