Sincere Williams, 18, allegedly stabbed 32-year-old Olga Calderon to death one week ago, according to Chicago Police.
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Police believe he's also responsible for other crimes in the area.
At an event on Sunday, Judge Pat O'Brien said Williams' criminal history should have prevented him from being out on the streets.
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O'Brien referenced a report from the Chicago Tribune, claiming that Williams' was charged last May with a violent break-in and theft of guns from a suburban gun shop, but was released from electronic monitoring in that case just days before Calderon's murder.
O'Brien said that decision to remove the monitoring device came with no objection from Foxx.
"They apparently thought it was a good idea to release this man into the community unsupervised. And this is not the only time that Ms. Foxx has failed to protect the community, the victims, and a victim like Ms. Calderon in specific," O'Brien said.
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ABC7 has reached out to Foxx's office for comment but have yet to hear back.
Williams has been charged with first-degree murder in the slaying of Calderon.
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