Final answer:
Gaspard, the Marquis's killer in 'A Tale of Two Cities,' was executed by hanging for his crime, and this was reported to Defarge by his fellow revolutionary, Jacques.
Step-by-step explanation:
The question concerns the character from Charles Dickens' novel A Tale of Two Cities. The Marquis's killer was a character named Gaspard, who killed the Marquis as revenge for the hit-and-run death of his child. After the murder, Gaspard was hunted down, and ultimately captured. He was then executed by hanging for his crime.
His fate was reported to Defarge, one of the revolutionary leaders and wine shop owner in the novel, by Jacques, who is a fellow revolutionary. This reflects the grim reality and attitudes towards justice and retribution during the time of the French Revolution, as captured by Dickens in his historical novel.