Regicide

n.	1.	(Eng. Hist.) One who kills or who murders a king; specifically (Eng. Hist.), one of the judges who condemned Charles I. to death.
	2.	The killing or the murder of a king.

Noun	1.	regicide - someone who commits regicide; the killer of a king
	2.	regicide - the act of killing a king

REGICIDE. The killing of a king, and, by extension, of a queen. Theorie des Lois Criminelles, vol. 1, p. 300.

aborticide, fratricide, fungicide, genocide, germicide, herbicide, homicide, infanticide, insecticide, matricide, microbicide, parricide, patricide, pesticide, rodenticide, sororicide, suicide, uxoricide, vermicide