'Murderer' in the Bible

But Elisha was sitting in his house, and the elders were sitting with him. Then the king sent a man from before him; but before the messenger came to him, he said to the elders, "Do you see how this son of a murderer has sent to take away my head? Behold, when the messenger comes, shut the door, and hold the door shut against him. Isn't the sound of his master's feet behind him?"

As Jehu entered in at the gate, she said, "Do you come in peace, Zimri, you murderer of your master?"