The military says that Fadi al-Wadiya, who was killed in an airstrike earlier this week, was a "significant operative" in the Islamic Jihad group and was involved in its rocket program.
Doctors Without Borders, known by its French acronym MSF, did not respond to a request for comment on the photos, which were released late Wednesday. The aid group said earlier that it had no indication he was a militant.
Also Thursday, the Israeli military said a soldier was killed and 15 others were wounded during a military operation overnight in the West Bank. There were no immediate reports of Palestinian casualties.
On Wednesday, an Iranian-backed umbrella group known as the Islamic Resistance in Iraq claimed an attack targeting the southern Israeli port city of Eilat. The militants are allied with Yemen's Houthi rebels, who are suspected of attacking a ship in the Gulf of Aden the same day.
Shipping has reduced drastically through the route crucial to Asian, Middle East and European markets in a campaign the Houthis say will continue as long as the Israel-Hamas war rages in the Gaza Strip.