Yemen's Houthi rebels say their Chief of Staff Muhammad Abd Al-Karim al-Ghamari, one of the most senior military officials of the group, was killed "while fulfilling his duties".
Without directly blaming Israel for his killing, Houthis said that the conflict with Israel had not ended.
Israel will "receive its deterrent punishment for the crimes it has committed".
The Houthi announcement offered no specifics on when or how he was killed.
In August, Israel targeted the Houthi group's chief of staff, defence minister and other senior figures in airstrikes on Sanaa in Yemen in which the prime minister of Yemen's Houthi-run government and several other ministers were killed.
Israel had said then that the air strike had targeted al-Ghamari, defence minister and other senior officials and th