Who died while Ezekiel was prophesying against the leaders in Ezekiel 11?

Answer: Pelatiah son of Benaiah

As Ezekiel prophesied, Pelatiah son of Benaiah, a leader of the people, died; Ezekiel fell facedown and cried out to the Lord GOD.

“Then the Spirit lifted me up and brought me to the gate of the house of the LORD that faces east. And there at the entrance of the gate were twenty-five men. Among them I saw Jaazaniah son of Azzur and Pelatiah son of Benaiah, who were leaders of the people.”— Ezekiel 11:1 (BSB)