The murderess was Charlotte Corday, I believe.

Bear with me, this ties in. My way of visiting an art museum is unusual. I will stride quickly from room to room (doubtless appearing a philistine) until I find one piece that "sings' to me - and then will long stay and study that one work, for half an hour or more.

I believe "The Dearth of Marat" is the title of a truly marvelous painting I thus viewed in the Louvre: Marat lies alone, slumped in the tub with him arm limp over the side. He is bleeding to death, and has lapsed into semi-consciousness.