WHEATON – In the first Chicago-area criminal case broadcast live, a suburban Chicago woman pleaded not guilty Wednesday to killing her 7-year-old son and the 5-year-old girl she was baby-sitting.

Prosecutors claim Elzbieta Plackowska, 40, of Naperville stabbed her son more than 100 times because she was angry with her husband, a truck driver who was often away from home. They say she stabbed the young girl about 50 times because she was a witness.

Plackowska stood silently in a blue jail uniform as her public defender entered not guilty pleas on her behalf to charges of first-degree murder.