The killing of one's brother (or sister).
A person who commits fratricide.
The intentional or unintentional killing of a comrade in arms.
The undesirable situation where the separate missiles from a MIRV interfere with each other as they explode.
The killing of a relative, especially a parent.
Someone who kills a relative, especially a parent.
The killing of a ruler, or other authority figure; treason.
Someone who commits treason.