An 84-year-old man killed his 89-year-old wife, frustrated that her ill health made her too frail to get around, investigators said.
Ewald Herman Nelson was charged with first-degree murder in Tuesday's slaying of Kathleen Genover, authorities said. Nelson was held without bail at the Lee County Jail.
Deputies said Nelson tried to get a woman renting a room at the couple's residence to kill his wife with a knife. When Mercedes Gonzales, 38, refused, Nelson slit his wife's throat as she lay in bed, investigators said.
Nelson and Genover, who were divorced and then remarried, often fought, and they argued about Gonzales living in their home, authorities said.
Police were investigating claims by neighbors that Genover had Alzheimer's disease.