As an honors student, he had completed a research project into the minds of serial killers by establishing correspondence with them and gaining interviews.
He wrote a book about his project and its effects, co-authored with counseling professor Jeffrey Kottler, and published in 1999 as The Last Victim: A True-Life Journey into the Mind of the Serial Killer.
He conducted research in order to learn what would most appeal to each of his subjects, and adopted the role of disciple, admirer, surrogate, or potential victim as necessary.
[3] A film adaptation of the book, Dear Mr. Gacy, was released in 2010, starring Jesse Moss (no relation) and William Forsythe.
Jason Moss died from a self-inflicted gunshot wound to the head in his Henderson, Nevada home on the morning of June 6, 2006.
According to his co-author Kottler, Moss reportedly had delved "heavily into Satanic stuff" while researching material to prepare for his correspondence with serial killers and while writing his book, but sounded upbeat in their last conversation before his death.