He was a seventy year-old school teacher who was killed by Billy Fleeter.
Bryan worked as a school teacher and had an addiction to gambling which eventually lead to his untimely demise by Billy Fleeter for not paying his bookie.
This case came to the attention of Assistant District Attorney Miguel Prado Fleeter appeared to be guilty, but when they investigated his death, they couldn't get any solid evidence on him. As a result, Fleeter walked free.
Later, Miguel told this story to his "friend" Dexter Morgan and together they avenged Thayer's death and two of Fleeter's other victims.
- In an article that mentioned him, Thayer is incorrectly stated to be 27-years-old.