Assassination

Assassination is the murder of a prominent person, often but not always a political leader or ruler, usually for political reasons or payment.

An assassination may be prompted by religious, political, or military motives; it is an act that may be done for financial gain, to avenge a grievance, from a desire to acquire fame or notoriety, or because of a military, security or insurgent group's command to carry out the homicide.

https://en.wikipedia.org/wiki/Assassination