Jurors convicted a St. Paul woman Monday in the fatal stabbing of her boyfriend last year following an argument about White Castle.

Melissa M. Fostvedt, 34, was convicted in Ramsey County District Court of second-degree murder without intent and acquitted of second-degree murder with intent in the Dec. 5 killing of Thomas Calvin Donald Jenkins. She is scheduled to be sentenced on Sept. 29.

According to the criminal complaint: Fostvedt stabbed Jenkins, 21, in the armpit after an argument about not getting enough food at White Castle. Jenkins' family members told police that Fostvedt often hit him, yelled at him and spit on him.

Fostvedt told authorities that he had slipped on water in her kitchen and fell on a knife, a story her two older children, ages 10 and 7 at the time, also echoed. But her 4-year-old son told interviewers that "Mommy stabbed Fat Head," a nickname for Jenkins. The child pointed at his armpit.

Police did not find spilled water on the kitchen floor, the complaint said. Fostvedt also had a cut or bruise on her arm — "and she had no idea where it had come from."

CHAO XIONG