fratricide:
(plural: ‘fratricides’)
This word is used more commonly used to talk about the act of killing one’s brother or sister rather than the person, and less commonly, usually related to military usage, used to refer to a shot or fire that kills or wounds a person/soldier of one’s own side/ally. For an informative article on what an act of fratricide is, please click here. For the right pronunciation of this word, please click here.
a person who has killed (murdered) his/her brother or sister,

a fratricide killing his brother
e.g.
In every religious script there is more than one fratricide who killed his brother to get to the throne or to marry his wife!
In war, a fratricide is a soldier who kills the soldiers of his own troops, either by accident or on some personal reasons.
As it seems there is bound to be a crazy fratricide in the history of every family, especially royal and rich families, where the fratricide is either the eldest of the sons or the youngest who suspects that his brothers are cheating him out of the family property or planning to kill him to get him out of the way.
For an excerpt from story about brotherhood and fratricide, please click here, for an article about Caesar, in ancient Rome, was a fratricide, please click here and for an article that shows us how this word is used in politics for some unjust or tyranny done by one person to his brother that would ruin his political career, which in politics is as worse as killing, please click here.
In military usage ‘fratricide’ is used to refer to the act of blowing up of or interference with a nuclear missile before it strikes its target caused by the earlier explosion of a warhead at a nearby target. For an article that shows us how this word is used in the context of military weapons killing soldiers of one’s own side, please click here.
Note: A “patricide” is a person who kills or has killed his/her own father; a ‘matricide‘ is a person who kills or has killed his/her own mother; a ‘parricide or parenticide‘ is a person who kills or has killed his/her own parents and any other close relatives; a “fratricide” is a person who kills or has killed his/her own brother; a ‘sororicide‘ is a person who kills or has killed his/her own sister; a “uxoricide” is a man who kills or has killed his wife; a “mariticide or viricide” is a woman who kills or has killed her husband; a “filicide or prolicide” is a person who kills or has killed his/her own children; an “infanticide” is a person who kills very young baby/infant; and a “homicide” is a person who kills another person, not necessarily his/her relative. And all the ‘..cides’ are used to refer not only to the persons involved but also to ‘the act of killing somebody’.
