King Nebuchadnezzar of Babylonia made Gedaliah, the son of Ahikam and grandson of Shaphan, governor of Judah, and placed him in charge of all those who had not been taken away to Babylonia. 1
References for 2 Kings 25:22
25.22-24 Jr 40.7-9.
When the Judean officers and soldiers who had not surrendered heard about this, they joined Gedaliah at Mizpah. These officers were Ishmael son of Nethaniah, Johanan son of Kareah, Seraiah son of Tanhumeth from the town of Netophah, and Jezaniah from Maacah.
Gedaliah said to them, "I give you my word that there is no need for you to be afraid of the Babylonian officials. Settle in this land, serve the king of Babylonia, and all will go well with you."
But in the seventh month of that year, Ishmael, the son of Nethaniah and grandson of Elishama, a member of the royal family, went to Mizpah with ten men, attacked Gedaliah, and killed him. He also killed the Israelites and Babylonians who were there with him. 2
References for 2 Kings 25:25
25.25 Jr 41.1-3.
Then all the Israelites, rich and poor alike, together with the army officers, left and went to Egypt, because they were afraid of the Babylonians. 3
References for 2 Kings 25:26
25.26 Jr 43.5-7.