Assassination: Amnon, by Absalom
Source: Nav
2 Samuel 13:28, 29
Now Absalom had ordered his young men, “Watch Amnon until his heart is merry with wine, and when I order you to strike Amnon down, you are to kill him. Do not be afraid. Have I not commanded you? Be courageous and valiant!” / So Absalom’s young men did to Amnon just as Absalom had ordered. Then all the other sons of the king got up, and each one fled on his mule.