Former Chicago police Supt. Jody Weis — who ordered the 2011 re-investigation of David Koschman’s death — says he’s troubled that high-ranking cops apparently fabricated a self-defense claim to avoid charging a nephew of Mayor Richard M. Daley.

“To me, the entire crux of this matter now is: How did the police department — how did the detectives — arrive at a self-defense claim based upon a comment attributed to Koschman that nobody can attribute to any witness?” Weis says....