A woman friend of Régis Jauffret's strangled herself on 21 March 2007, coincidentally exactly two years after he had met her at the Salon du livre in Paris on 21 March 2005. Lacrimosa is a novel based around those bare facts, although I'm unaware of the truth of any others in this work.
My other posts on Régis Jauffret:
Régis Jauffret: Claustria
Régis Jauffret: Sévère