Renz then drove them a short distance until the car got stuck in a snow bank, prosecutors said. It was there, they said, that he tried to restrain the mother and the child escaped, looking back to see her mother had gotten out of the car and was being chased by Renz.
A passing motorist found the girl and alerted police who caught Renz nearby after a foot chase. Fitzpatrick said Renz had the woman's car keys and blood on his clothes matched that of the child.
Chief Assistant District Attorney Matthew Doran said a knife found on the snow nearby is being tested to determine if it was used to kill the mother. He said the air pistol hasn't been found.
Renz, who lived in Cicero, has pleaded not guilty in both the federal and state cases. On Wednesday, a judge set a June 3 trial date for the federal child porn case.
A federal grand jury indicted him last month on one count of receiving and five counts of possessing child pornography. An FBI investigation led to the charges that he downloaded the pornography featuring young girls over the course of two years and had five DVDs and CDs, according to the indictment.
The state indictment handed up Wednesday includes multiple counts of murder, kidnapping, predatory sexual assault against a child, sexual abuse, menacing, weapon possession, and possessing a sexual performance by a child.