- "I did it! The bastard deserved it! He got my father killed! My father was no traitor, that filthy scum Marat was!"
- ―Lasalle on the assassination of Jean-Paul Marat, 1793.[src]
Marat accused Lasalle's father of being a traitor in a newspaper article, and the latter was killed, causing Lasalle to harbor a deep hatred for the politician. When Marat was assassinated, Lasalle became a suspect and was imprisoned at St. Germain. On being questioned by Arno Dorian, he claimed to have killed Marat to avenge his father.