Metro

Boxborough mom accused of stabbing son in the back

A Boxborough woman is accused of stabbing her son in the back early Thursday morning, according to police.

Boxborough police Lieutenant Warren J. O’Brien said the 22-year-old victim walked into the Acton police station around 12:20 a.m. Thursday and reported that his mother had just stabbed him. The man had a stab wound in his upper back near his spine and was bleeding profusely. He was taken to the Lahey Hospital and Medical Center for treatment, O’Brien said.

Police said prior to their altercation the son had apparently been smoking in her apartment against her wishes, and an argument ensued.

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“She admitted she had stabbed him over an argument over smoking,” O’Brien said.

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Karin Evans was subsequently arrested and charged with armed assault to murder, assault and battery, and assault and battery with a dangerous weapon. She is being held without bail and has a dangerousness hearing scheduled for Thursday, Nov. 16 in Ayer District Court.

Her defense attorney, Joseph M. Perullo, said Evans’s son has a criminal history and has been violent toward his mother in the past. He also noted that she suffered a large bump on the back of her head that night.

“There’s long history between the mother and the son,” he said. “There is evidence that she was acting in self-defense.”

Emily Sweeney can be reached at esweeney@globe.com. Follow her on Twitter @emilysweeney.