| Khalil al-Hayya grew up in Gaza during its time under Egyptian rule. |
| He started as a part-time teacher after completing his graduation. |
| He has been linked with the Muslim Brotherhood since the 1980s. |
| Joined Hamas in 1987 amid the Palestinian revolt against Israel. |
| Was a close associate of former Hamas leader Yahya Sinwar. |
| Criticized President Mahmoud Abbas after the Palestinian Legislative Elections in 2006. |
| Lost seven family members in Israeli air strikes in 2007, which were intended to target him. |
| Experienced personal tragedy with the loss of one of his sons in 2008 due to an airstrike. |
| Advocated for Palestinian state recognition and unity among Palestinian factions. |
| Recognized the need for new leadership in the PA to better represent the people. |
| Participated in reconciliation talks with Fatah in Algeria in January 2022. |
| Publicly addressed the need for ending conflict while establishing a Palestinian state. |
| Attended a notable meeting with Syrian President Bashar al-Assad to mend relations after years of conflict. |
| Played a significant role in plans for attacks against Israel, notably in October 2023. |
