Mohammed Deif: Hamas Military Commander Profile & Facts

For decades, Mohammed Deif ranked among Israel's most wanted individuals. He rarely appeared in public, recent photographs of him were scarce, and Israel made repeated attempts to eliminate him—yet for years he managed to survive. Only in July 2024 did the long pursuit end, when the Israeli military killed him in a strike near Khan Younis in Gaza. Here are ten facts about the man who commanded Hamas's military wing, the Izz ad-Din al-Qassam Brigades.

1. "Deif" Was Not His Real Name

He was born Mohammed Diab Ibrahim al-Masri. The nickname "Deif," meaning "guest" in Arabic, apparently stuck because of the underground lifestyle he led, constantly changing his residence and hiding places. He was also known by the alias "Abu Khaled."

2. He Grew Up in Khan Younis and Knew Yahya Sinwar Since Childhood

Deif was born on August 12, 1965, in the Khan Younis refugee camp in the Gaza Strip. His family originally came from the village of al-Qubeiba, in an area where Kibbutz Gevulot is located today. According to reports, Deif knew Yahya Sinwar—who would also become a senior Hamas leader—from childhood. In his youth, Deif joined the Muslim Brotherhood movement.

Before Hamas, He Was a Student Activist

Deif studied at the Islamic University of Gaza, an institution that produced many Hamas leaders over the years. During his studies, he was active in the "Islamic Bloc" and served as a representative on the university's student council. He later joined Hamas's military apparatus at the start of the First Intifada.

Muhammad Odeh with Khan Yunis brigade commander Rafa Salamah, Hamas spokesman Abu Obaida, and military wing head Muhammad Deif

4. He Previously Served Time in Israeli Prison

In May 1989, Israel arrested Deif, shortly after Yahya Sinwar's arrest that same year. He was held in an Israeli prison in Khan Younis for approximately 16 months before being released under circumstances that were not publicly disclosed. Soon after his release, he continued advancing within Hamas's military structure, joining the Qassam Brigades in 1991.

5. He Was a Protégé of "The Engineer"

Early in his military career, Deif was a student of Yahia Ayyash, known as "The Engineer," who was considered one of Hamas's top attack planners. During the 1990s, Deif himself became a central figure in the organization's terror infrastructure. He was held responsible for operating cells that kidnapped and murdered Israeli soldiers Nachshon Waxman, Aryeh Frankenthal, and Shahar Simani, and was implicated in a series of deadly suicide bombings.

6. He Also Helped Develop Qassam Rockets

In the early 2000s, Deif worked on building an independent attack apparatus for the Qassam Brigades, but his activities extended beyond that. He actively participated in the project to manufacture Qassam rockets, working alongside Adnan al-Ghoul, considered Hamas's "chief scientist." After the elimination of Salah Shehadeh in July 2002, Deif assumed leadership of Hamas's military wing—a position he held for more than two decades.

7. Israel Tried Repeatedly to Kill Him

Over the years, Deif became one of the Israeli security establishment's primary targets. As early as 1998, he evaded an Israeli force waiting for him near the Philadelphi Corridor, and in 2001 another attempt was made to eliminate him along with other senior Hamas figures. A year later, an Apache helicopter fired two Hellfire missiles at his car. Deif survived that attack as well, though he was injured and subsequently suffered from speech difficulties and limited limb movement. Despite this, by 2003 he had returned to active operations.

8. In a 2014 Assassination Attempt, His Wife and Two Children Were Killed

During Operation Protective Edge in 2014, Israel again attempted to eliminate Deif. In an August 2014 strike, he survived, but his wife and two of his children were killed. According to published information about his personal life, Deif was married to at least two women and fathered several children. For an extended period after the 2014 strike, rumors circulated that he had been killed, until it became clear he had survived.

9. He Was a Principal Architect of the October 7 Massacre

On the morning of October 7, 2023, as Hamas terrorists infiltrated Israeli communities and carried out the massacre, a recording of Deif was released in which he announced the launch of "Operation Al-Aqsa Flood" and called for joining the fight against Israel. Deif, then commander of Hamas's military wing, is considered one of the principal planners of the attack alongside Yahya Sinwar.

10. After Years of Attempts, Israel Successfully Eliminated Him

On July 13, 2024, the Israeli Air Force struck the al-Mawasi area near Khan Younis in an operation designed to eliminate Deif. For weeks it remained unclear whether he had actually been killed, but on August 1, the Israeli military officially announced that accumulated intelligence confirmed his death. Hamas refrained from confirming this for months, only officially acknowledging in January 2025 that Deif had been eliminated. Thus ended an Israeli pursuit that had lasted more than two decades.