A coroner says an autopsy has revealed that an 11-year-old suburban Chicago girl was stabbed more than 30 times.

Lake County's coroner, Dr. Thomas Rudd, says the girl died from multiple sharp force injuries. He says most of the stab wounds were to her neck, chest and arms but says that Wednesday's autopsy also found the girl had cuts to her face and two stab wounds that pierced her left lung.

Prosecutors approved a first-degree murder charge against a 14-year-old girl on Wednesday, a day after the girl's body was found in a Mundelein home.

Rudd says there are signs the 11-year-old struggled with her attacker. He says there were defensive wounds on both hands.