MIDDLEFIELD, Ohio (AP) – James M. Mason knew his wife since she was born a boy. The janitor and former military man was a boarder in the child’s home and was treated like family.

Many were surprised when he married Chris nearly three years ago, not just because he knew she underwent sex-change surgery three years before, temporarily calling herself Christine Newton-John after the pop singer with the same last name. He was in his 70s, she in her 30s. He was mild-mannered; she had a domineering personality.

Then, last summer, there was another surprise: Chris Mason was accused of exercising her frail husband to death so she could inherit his retirement benefits, in an attack caught on surveillance video.

Mason was sentenced Friday to four years in prison on her guilty plea to reckless homicide. She expressed remorse to her family members during a hearing in Geauga County court.

“I want to apologize to my former husband’s half-sister for her loss as well as to my family and for my loss,” she said in court. “It’s been very upsetting and devastating for our entire family.”

They were in love, Mason said. “I’m not going to let jail turn me away. I will continue to hold my head up high and keep plugging along and moving along as I go through my life,” she said.

Police say she forced James Mason, who had heart disease, to do stressful activity in an indoor pool for more than two hours. He collapsed and died the next day after Chris Mason authorized his removal from life support.

“It’s just been a total nightmare,” said Maryanne Vallandingham, Chris Mason’s mother, who is ill with emphysema and distraught over her daughter’s fate and the death of a close son-in-law.

Vallandingham, who was present during the attack that killed James Mason but told police she didn’t see any harsh treatment, does recall previous conflicts between the couple.

She told police she once saw her daughter flip a chair while James Mason was sitting in it, putting a hole in a wall. She said she saw James Mason standing with his nose to a wall in the corner of the living room because, he told her, his wife had ordered it.

Neighbors at times heard yelling and objects being thrown in the couple’s apartment and complained to a Geauga County social service agency that checks on the safety of the elderly, said Middlefield Police Chief Joseph Stehlik.

“They both had good days and bad days,” Vallandingham said. “Some things Chris did, well … Chris needs help,” she said, adding that her daughter once was a crack cocaine user.

Chris Mason told police that she didn’t intentionally kill her husband and that they were in the swimming pool at their apartment complex so he could exercise.

A security videotape shows Chris Mason pulling her husband by his arms and legs on June 2, tossing and dunking him. Sometimes he clings to the side of the pool and his wife pulls him away. She appears to block his path as he tries to get out of the water – 43 times, by the police chief’s count.

At other times James Mason gets out but goes back in. He doesn’t swim but walks slowly in the 3-foot-deep end of the pool.

Chris Mason’s attorney, public defender Bob Umholtz, declined to comment.

James Mason, who had coronary artery disease, suffered a heart attack. An autopsy shows that his major arteries had potentially fatal blockages of about 75 percent, Geauga County Coroner Kevin Chartrand said. It was fine for James Mason to exercise, but the condition of his heart made strenuous activity a risk, Chartrand said.

Police Chief Stehlik had expected a murder charge, convinced that Chris Mason knew her husband had a weak heart and that she would get VA benefits and Social Security as his widow. He said she did receive benefits of more than $860 a month from the VA and at least one retirement account.

But because there is no audio on the security video, the grand jury could not know what the couple said to each other, Joyce said. They do not appear to be arguing. He does not appear to be fighting her off. She was indicted on a charge of reckless homicide, a third-degree felony.

Vondrasek said she and Chris Mason both wept as James Mason died.

But James Mason’s half-sister, Cinda Meyer, said Chris Mason appeared to show little grief.

“She had him cremated, and she called and told me to come and pick up the ashes and do something with them,” said Meyer, of Seville in northeast Ohio. “She was pretending to be a grieving widow.”

Meyer said she arranged her brother’s funeral. Chris Mason did not attend.