While these things were happening in the temple, Athaliah, being alarmed by the shouts of the gathering people and by the noise of the crowds, ran to the temple. But while she was trying to restrain the riot with her presence and voice, she was arrested by the guards of the king and was brought outside the walls of the temple, where she was killed by order of the high priest, lest her blood might pollute the house of God. So the prophetic predictions about the annihilation of the family of Ahab were gradually accomplished through different deaths.
Source: ON THE SECOND BOOK OF KINGS 11:13