has any book been written on him?
He wrote his autobiography " Playing with Fire" with Kristie McLellan Day.
Theoren Fleury
With the help of Kirstie McLellan Day, Fleury wrote his autobiography, "Playing with Fire", which was released on October 16, 2009. 
who was theoren fleury? Former professional ice hockey player. in which year was he born? 29 June 1968. where did he finish his studies from? UNANSWERABLE when did he first gain interest in the game? When he borrowed an old pair of skates and a broken stick to play his first game at the age of five. which was the first main game he played? He  began his junior career with the St. James Canadians of the Manitoba Junior Hockey League. when did this league start? 1918-19. did any incident take place with this league? Yes, the incident regarding Butch Goring changing teams. did this league win any championship? Yes, Abbott Cup (1971–1999) Western Canadian Junior ‘A’ Championships. did the player win any awards? The Canadian Humanitarian Award and the Queen's Jubilee Medallion. when did he win the first award? UNANSWERABLE did he ever leave playing the game? 28 September,2009.
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Theoren Fleury [SEP] Autobiography
With the help of Kirstie McLellan Day, Fleury wrote his autobiography, "Playing with Fire", which was released on October 16, 2009. In it, he explained that he was sexually abused by Graham James over a period of two years. While he stated he "doesn't want to become the poster boy for abuse by James", Fleury hoped that speaking out might make it easier for other childhood sexual abuse victims to come forward, and get help. He blamed the abuse for turning him into a "raging, alcoholic lunatic", and claimed to have placed a loaded gun in his mouth and contemplated suicide in 2004.