Asher Gruenberg, 50, of Skokie, Illinois, was killed on November 18, 1974. He had worked for a steel company before moving into construction. His death was one of four murders of working men in Chicago over a four-day period in 1974 attributed to Gary Duane Rardon.

Gary Duane Rardon, born September 4, 1943, in Wayne County, North Carolina, had prior federal convictions for interstate transportation of a stolen vehicle and for possessing an unregistered firearm. Reports say psychiatrists had described him as near psychotic and very dangerous; he was paroled in 1967 and later carried out a violent spree that included Gruenberg’s killing. Rardon was arrested and convicted on multiple counts of murder, including the death of Gruenberg.

What details about Asher’s life or the crime scene might help historians or relatives fill gaps in this case?