Apparently he was upset about getting an $0.89 tip for a 30 minute trip delivery.
And no, he was NOT from Florida.
https://www.knoxnews.com/story/news/crime/2019/02/26/maryville-howard-matthew-webb-food-tampering-dinner-delivered/2993613002/ (https://www.knoxnews.com/story/news/crime/2019/02/26/maryville-howard-matthew-webb-food-tampering-dinner-delivered/2993613002/)