In 1984, along with some other extremist students of Paris University, he formed a radical activist group called "L'Heure Sanguine" -- the "Bloody Hour." During a bombing in which several people died, all the activists escaped except for one – Michael Samuelle. He was sent to prison where he supposedly died. After many years, Rene resurfaces and Michael, now a Section operative, recognizes his work and attempts to protect him. Michael feels obligated to protect Rene since Rene took in Michael’s sister after his arrest and provided for her. Once Rene is apprehended he attempts to deflect their interest in him and his small group by saying he works for Red Cell. Michael knows this is unlikely and is unsure whether he will be able to carry out the profile to eliminate Rene and what’s left of his organization. Michael uses Rene to lead him to the remaining members of the organization and then Section teams take them out. Before he dies Rene becomes clearly aware of Michael’s betrayal. Rene Dian is profiled in S2 "Half Life".