Amazon has it: https://www.amazon.com/TRASH-BAG-MURDERER-Tony-Stewart/dp/055790899X
I checked WorldCat but it doesn't appear to be in any library collections. It's self-published and one of the GoodReads reviewers notes that it's so riddled with misspellings it's hard to understand at points, so this is definitely not going to be floating around in mainstream collections.
Apparently, he worked as an aeronautical engineer. Some sources, including the Redford database, put his IQ at 180.
Also, he may be the subject of the worst serial killer book cover ever made: https://www.amazon.com/TRASH-BAG-MURDERER-Tony-Stewart/dp/055790899X