Robert Shaw was accused of suffocating his ailing, 84-year-old wife, Virginia, at home in Avon in 2008.

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ELYRIA -- A northeast Ohio man who says he killed his wife of 65 years to end her suffering has agreed to serve four years in prison under a plea agreement.

Ninety-year-old Robert Shaw pleaded guilty Wednesday to one count of involuntary manslaughter in Lorain County Common Pleas Court.

He originally faced aggravated murder and felonious assault charges. Shaw was accused of suffocating his ailing, 84-year-old wife, Virginia, at home in Avon in 2008.

The Chronicle-Telegram in Elyria reports Shaw told police his wife had medical problems and he acted to end her misery.

In February, a judge had found Shaw competent for trial. He will be officially sentenced later. Shaw's attorney Kenneth Lieux didn't return messages seeking comment Wednesday.

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