Mystery or Wild Goose Chase: The Ricky McCormick Code

https://en.wikipedia.org/wiki/Ricky_McCormick%27s_encrypted_notes
https://forms.fbi.gov/code
https://www.riverfronttimes.com/stlouis/code-dead-do-the-encrypted-writings-of-ricky-mccormick-hold-the-key-to-his-mysterious-death/Content?oid=2498959
https://www.nytimes.com/2011/04/01/us/01code.html
https://www.fbi.gov/services/laboratory/scientific-analysis/cryptanalysis-racketeering
https://blogs.scientificamerican.com/observations/why-history-should-matter-to-code-breakers/
https://www.stltoday.com/news/article_bcc02074-5b1a-11e0-b199-0017a4a78c22.html
https://www.kmov.com/news/a-puzzling-case-help-solve-this-cryptic-cold-case-that-has-stumped-detectives/article_3576274c-4c17-11ea-bf6a-b7920f8d32e9.html
https://www.fbi.gov/news/stories/help-solve-an-open-murder-case-part-2
https://web.archive.org/web/20110505013634/https://www.fbi.gov/news/stories/2011/march/cryptanalysis_032911