CHICAGO (Map, News) - A judge has ruled that a homeless woman accused of setting a fire that killed four people on Chicago's North Side is not guilty by reason of insanity.

Cook County Circuit Judge James Linn's ruling Friday means Mary Smith will return to court June 10th for a decision on where Smith will be housed and the course of her treatment.

Prosecutors have said Smith gave a videotaped statement in which she admitted setting the March 2007 fire in an apartment stairwell.

Prosecutors say Smith told investigators she set the fire by lighting a dollar bill to warm her feet after losing her shoes.