What did Clytmnestra use to kill Agamemnon?

Clytemnestra killed Agamemnon using a double-headed axe known as a "labrys." After luring him back home from the Trojan War, she ambushed him in the bath, striking him fatally. This act was driven by her desire for revenge due to Agamemnon's sacrifice of their daughter Iphigenia and his infidelity during the war.