ST. PAUL — A judge has found a St. Paul woman accused of killing her 5-week-old son incompetent to stand trial due to mental illness.

Ramsey County District Judge Diane Alshouse made the ruling Monday based on a court-ordered mental health examination of 22-year-old Shwe Htoo. The St. Paul Pioneer Press reports that the judge also ordered Htoo’s case to be suspended until there’s a change in her mental status.

Police say Htoo, who’s charged with second-degree murder, confessed to smothering her son, Michael Kyaw Htoo, on Nov. 18 after initially trying to poison him. A criminal complaint says she then put the infant’s body in her car and crashed it into a light pole in an attempt to kill herself.