John Wesley Hardin is part-folk hero, part-terrible human being, all deadliest Texas Outlaw.
Resources:
https://en.wikipedia.org/wiki/John_Wesley_Hardin
https://www.tshaonline.org/handbook/entries/hardin-john-wesley
You can read his biography for free here: https://www.google.com/books/edition/The_Life_of_John_Wesley_Hardin/jLM-AAAAYAAJ?hl=en&gbpv=1
Texas: Slang for Crazy 