Her son was her whole world. And Nanci Koschman never recovered from his death.

David Koschman died 21 years ago as the result of brain injuries suffered when he was punched in the face by a stranger who then ran away.

Mrs. Koschman, a widow, made the call to remove him from life support.

For years, she didn’t know who’d thrown the punch that caused her only child to fall and crack his head on a curb on a spring night in 2004 when he and some friends were out celebrating their 21st birthdays in Chicago’s fabled Rush Street nightlife district.

She buried her son and returned to her tiny home in Mount Prospect, where she kept the window coverings drawn and her son’s room just as he’d left it.

It took years until she would learn who killed her son. That was the result of a Chicago Sun-Ti

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