Earlier this month, Jayden Perkins was stabbed to death in Edgewater, while trying to protect his pregnant mother, who was seriously injured.
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The suspect in the case, Crosetti Brand, 37, a former boyfriend of Perkins' mother, had been released from prison on parole hours before the attack.
He allegedly broke into Perkins' mother's apartment and repeatedly stabbed her.
Gov. JB Pritzker released a statement Monday, saying "It is clear that evidence in this case was not given the careful consideration that victims of domestic violence deserve and I am committed to ensuring additional safeguards and training are in place to prevent tragedies like this from happening again."
SEE MORE: Man kills boy, injures woman in Edgewater stabbing day after being released on parole, officials say
LeAnn Miller, who resigned, was the lead reviewer of the case, the governor's office said.
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Pritzker will announce appointments to fill current PRB vacancies following a thorough search.
The tragedy has shaken the Edgewater neighborhood.
"There is a lot to be concerned about as it relates to how the Prison Review Board moves forward and why the resignation of the person who made this decision is warranted and necessary," 40th Ward Ald. Andre Vasquez said.
The incident took place in Vasquez's ward.
He said Miller made the right decision to resign.
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Brand has a long and well-documented history of domestic violence against multiple women, including Perkins' mother.
"My understanding is that the board itself is gonna go to some more like domestic violence survivor training to get a better understanding of cases like this and really think through how best to address them," Vasquez said.
Ald. Vasquez said as his community begins to heal, the gaps in the judicial system locally and on a state level must be addressed.
"What we can do in this moment is coming together as a community, knowing how much Jayden touched all of our lives, and make sure that we do things that we can to support the family and to prevent any incidents like this from ever occurring again," he said.
Ald. Vasquez said there was a small and private funeral held Monday morning for Perkins.
While his mother was severely injured in the attack, she was well enough to attend Monday.
Later Monday, Pritzker announced the resignation of Prisoner Review Board chair Donald Shelton.
Shelton had served on the PRB since September of 2012, joining the board after a lengthy career with the Champaign Police Department, a news release said.
"Donald Shelton served the state of Illinois in his role with the PRB for over a decade, providing a model of dedication to public service," Pritzker said in a statement. "During his time with the Champaign Police Department and with the PRB he worked diligently to keep Illinoisans safe and uphold our justice system, and I thank him for his service."
There was no reason given for Shelton's resignation.