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(the person who commits regicide)

regicide — /rejasayd/riyV. The murder of a sovereign; also the person who commits such murder … Black's law dictionary
Lonely hearts killer — Homicide Murder … Wikipedia
fratricide — noun a) The killing of ones brother (or sister). The conversion of Russia to Christianity was effected, it would seem by a monster of cruelty and lust. That Vladimir (980 1015) was a fratricide, who maintained 3,500 concubines, has not prevented… … Wiktionary
literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… … Universalium
Manslaughter — For other uses, see Manslaughter (disambiguation). Homicide … Wikipedia