She then wrote her `` Addresse aux Français amis des lois et de la paix '' ( `` Address to the French people , friends of Law and Peace '' ) to explain her motives for assassinating Marat .
In the letter , she explained why she had killed Marat . She called it `` Addresse aux Français amis des lois et de la paix '' ( `` Address to the French people , friends of law and peace '' ) .