A high school senior was shot dead at a Chicago area mall on Monday, causing chaos and sparking a manhunt for the gunman.
Authorities believe the victim and suspect knew each other and that it was an isolated incident, police said.
Witnesses said two men were in an altercation and one of the men fired multiple times, hitting the victim, police said.
Javon Britton, 18, was shot several times and taken to a hospital where he was declared dead, police said.
A second victim suffered a graze wound, police said.
The suspect, 19-year-old Jakharr Williams, fled the mall before authorities arrived, police said.
Williams, who has an active parole warrant, should be considered armed and dangerous, police said.
Eric Russell, a spokesman for Britton's family, has urged Williams to turn himself in.
Britton's parents "are in excruciating pain," Russell told reporters Tuesday. "All of our hearts skip a beat when we have children in the world that have fallen to senseless gun violence."
Britton planned to graduate from high school in June and study technology and electronics, Russell said. He hoped to become an engineer.
"We have to ask ourselves," Russell said, "is there any safe place for our children to congregate?"
Illinois State Senator Elgie Sims Jr. said he was at the mall when the shooting broke out.
"A young man was gunned down literally feet from where my and other families were shopping," he wrote on Facebook.
Beyond the tragedy of "another senseless shooting," Sims said the second tragedy was that the children who witnessed the aftermath lost some of their innocence.
"I and the other parents tried to shield the children from the reality of what just occurred but after seeing the terror in their eyes these children will remember this day for years to come," he wrote. "When will we come to grips with the fact that we MUST deal with the flow of illegal guns onto our streets and the trauma that is turning our young people into victims and perpetrators of violence."