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Sources:

https://www.fox32chicago.com/news/niles-cold-case-murder-solved-after-nearly-30-years

https://chicago.suntimes.com/crime/2021/10/20/22737249/niles-cold-case-helen-cardwell-richard-sisto

https://www.fox32chicago.com/news/man-arrested-in-decades-old-cold-case-of-woman-strangled-with-sweater-in-niles-ymca

https://www.ymcachicago.org/irvingpark/programs/housing

https://chicagotribune.newspapers.com/clip/87823225/helen-kent-marple-cardwell-murder/

https://www.cbsnews.com/chicago/news/1992-niles-cold-case-murder-helen-caldwell/

https://www.journal-topics.com/articles/report-man-charged-in-92-niles-ymca-murder-was-on-parole/

https://www.chicagotribune.com/news/ct-xpm-2005-08-26-0508260297-story.html