2 Kings 25:23, 25

Now when all the captains and their men heard that the king of Babylon had appointed Gedaliah governor, they came with their men to Gedaliah at Mizpah, namely, Ishmael the son of Nethaniah, and Johanan the son of Kareah, and Seraiah the son of Tanhumeth the Netophathite, and Jaazaniah the son of the Maacathite.

But in the seventh month, Ishmael the son of Nethaniah, son of Elishama, of the royal family, came with ten men and struck down Gedaliah and put him to death along with the Jews and the Chaldeans who were with him at Mizpah.