CHARLOTTE, N.C. (AP) — The man accused in the death of a North Carolina college professor has pleaded guilty to second-degree murder.

Donny Lewis Franklin pleaded guilty in a Mecklenburg County court on Friday in the death of UNC Charlotte professor Jeannine Skinner. She was an assistant professor of gerontology and psychology.

Skinner was found dead last September in her apartment, and an autopsy found she had been stabbed more than 200 times.

The 46-year-old Franklin, who was in a relationship with Skinner, was arrested and charged with first-degree murder three days after her death. He was sentenced to between 28 and 35½ years in prison.

The Charlotte Observer reports more than a quarter of Charlotte's homicide victims last year were killed by a partner or close relative.