An Ohio man convicted of fatally shooting his ailing wife in her hospital bed was sentenced Friday to six years in prison.

John Wise, 68, has said he shot his debilitated wife out of love in August 2012 after she suffered aneurysms and appeared to be in pain at an Akron hospital. Mercy is not a defence to a murder charge in Ohio.

John Wise, 67, seen here in court in November 2013, was sentenced to six years in prison for shooting hi 65-year old wife to death at Akron General Medical Center in 2012. (Phil Masturzo, Akron Beacon Journal/Associated Press)

The sentence issued by Summit County Court of Common Pleas Judge Mary Margaret Rowlands was in line with a prosecutor's recommendation that Wise receive a lighter punishment than the minimum 23 years on his most serious conviction, an aggravated murder count with a firearm specification.

Wise's attorney, Paul Adamson, said ahead of the sentencing that they will pursue clemency from the governor no matter the punishment.

County Prosecutor Sherri Bevan Walsh had called Wise's actions illegal and dangerous but said the case warranted leniency. She had recommended that Wise be sentenced on a lesser offence, manslaughter.

Neither side had found previous case law to support the prosecutor's suggestion that the judge could sentence Wise to six years for manslaughter, a charge that wasn't among the counts against him but is considered a lesser included offence.

The prosecution instead asked the judge to sentence Wise for his felonious assault conviction with a firearms specification, and the judge did so. Wise was also convicted of aggravated murder and murder, which could have led to a life sentence.

Had planned to commit suicide

Police say Wise calmly walked into his wife's hospital room on Aug. 4, 2012, and shot her at her bedside. She died the next day.

Wise told police he intended to kill himself after shooting his wife, but the weapon jammed.

"My recollection is that I walked in there, and within two minutes, I kissed her on the cheek and shot her," Wise told jurors.

Barbara Wise, 65, was in the intensive care unit at Akron General Medical Center after suffering triple cerebral aneurysms that had left her unable to speak, a family friend has said.

A doctor testified that Barbara Wise wasn't terminally ill and seemed to be responding to treatment.

Wise testified that he couldn't stand to see his wife of 45 years in pain in the hospital and decided on his course of action after seeing a tear roll down her cheek.