'Murderer' in the Bible

But Elisha was sitting in his house, and the elders were sitting with him; and the king'sent a man from before him: but ere the messenger came to him, he said to the elders, See ye how this son of a murderer hath sent to take away my head? look, when the messenger cometh, shut the door, and hold the door fast against him: is not the sound of his master's feet behind him?

And as Jehu entered in at the gate, she said, Is it peace, thou Zimri, thy master's murderer?