NEW YORK (AP) — The mother of a 7-year-old girl beaten to death by her stepfather provoked the man to abuse the child and did nothing to help as her daughter — cold, naked and battered — lay dying on their apartment floor, prosecutors told jurors Thursday.

In an abuse case that cast a spotlight on New York's troubled child welfare agency, Nixzaliz Santiago went on trial in Brooklyn state court on charges of second-degree murder, manslaughter and reckless endangerment in the death of her daughter, Nixzmary Brown. She has pleaded not guilty.

Nixzmary died Jan. 11, 2006, of a vicious blow to the head while being punished for stealing yogurt. Investigators discovered she had been a virtual prisoner, confined to a room with dirty mattresses, a broken radiator, an old wooden school chair she was bound to with a rope, and a litter box she was forced to use instead of a toilet.

Nixzmary was so malnourished when she died that she weighed only 36 pounds.