It's important to note that:
* Marat was a journalist and revolutionary leader. He was known for his radical political views and his writings in the newspaper "L'Ami du Peuple," which often advocated for extreme measures against the enemies of the French Revolution.
* Marat was assassinated in his bathtub in 1793. He was killed by Charlotte Corday, a young woman who believed he was a threat to the Revolution.
While Marat's writings were inflammatory and advocated for violence against those he considered enemies, there is no historical record of him personally killing anyone.