Williams was a student at the University of Illinois. day was in high school, but he took part in a DeVry University program for gifted students.
Saturday, there were calls for anyone with information about the murders to come forward.
"I don't question God. I don't question his method. I just say, 'Lord, I'm lonely for them and remove the hurt.' That's all I ask," said family member Lorraine Sanya.
Congressman Danny Davis, Mayor Daley and police Supt. Jody Weis all called for anyone with information about the murders to come forward.
"The family for these two young men has been unbelievable. They've exhibited courage, resolve, but we're not hearing other information coming into us," Weis said.
Sanya, Williams' aunt, echoed that messasge and talked about the moment when her nephew walked into the house and told her he'd been shot.
"My first thought was, 'No, this is not real.' But in a split second, I said, 'Tyrone, don't play like that.' And I looked at my boy on the floo, and he was dead," she said.
A $12,000 reward is being offered in the case.