Originally charged with murder, Evelyn Johnson pleaded guilty in December to a reduced count of manslaughter for the August 2004 slaying.
The 71-year-old victim had made his wife a cup of coffee and was apologizing and offering to reconcile when she opened fire with a .22-caliber pistol inside the camper trailer where he lived, striking the man five times, according to court documents.
The case has been delayed for years because of questions surrounding the woman's mental health. In May of last year, doctors found her competent.
Thomas said the woman was often deemed incompetent during short-term evaluations but later deemed competent while receiving in-patient treatment because doctors could monitor her behavior.
"I want you to know how very sorry I am for what has happened but under the circumstances and all the medication I was taking, no wonder it has come to this," Johnson told Judge A. Lynn Payne in an October letter to the court.
"I'm so confused in my head about what is taking place and I have a hard time understanding the legalities of all of this," she wrote, "It happened so many years ago, I'm not sure what is what anymore. My mind and body hurt from the moment I rise in the morning until the moment I lay down at night."
In the letter, Johnson told the judge she realized she had "broken the law and that there are consequences for my actions" and that she was "tired and ready to know my fate."
Thomas said Johnson "presented herself as very feeble" during her court proceedings, though he questioned whether that was genuine.