Sayyid Mahmud Ibraheem Zakzaky, widely remembered by the affectionate honorific Shehu and also nicknamed Mahadi, was born on 20 March 1995 (corresponding to 20 Shawwal 1415 AH) in the Kwarbai quarter of Zaria City, Kaduna State, Nigeria. He was the sixth child of the leader of the Islamic Movement in Nigeria, Allamah Sayyid Ibraheem Zakzaky, and Malama Zeenatuddeen.

Sayyid Mahmud descended from a venerable lineage of scholars and community leaders on both sides of his family:

• Paternal ancestry: Through his father, Allamah Ibraheem Zakzaky, his lineage traces through Malam Yaqoub, Malam Aliy, Malam Muhammad Tajuddin, and Liman Husaini, a respected resident imam and scholar. Malam Muhammad Tajuddin arrived in Zaria from Sokoto alongside the emir Malam Musa during the era of Shaykh Usman dan Fodiyo to serve as an Islamic legal and administrative adviser. The family's deeper ancestry traces through Mali to the historic city of Shinqit (in present-day Mauritania) and the Maghreb, descending from Imam Hasan al-Mujtaba, the grandson of the Prophet Muhammad.
• Maternal ancestry: His mother, Malama Zeenatuddeen, is the daughter of Ibrahim, son of Muhammad Auwal. Her maternal grandmother was Maryam, daughter of Abdullahi, and a direct descendant of Imam Akayede of Ilorin in Kwara State.

Raised in an environment steeped in knowledge and devotion, Sayyid Mahmud demonstrated exceptional academic aptitude from early childhood. He completed the Baghdadi Quranic primer in under five days and established a disciplined daily routine of memorizing extensive passages of the Holy Quran each morning. To support his rapid advancement, tutors such as Malam Tanimu of Tudun Jukun were invited to guide his memorization.

His formal schooling traversed several institutions in Zaria:

• Nursery education at Books International School (1999–2000).
• Primary education begun at Books International School (2001–2006) and completed at Zaria Children School.
• Junior secondary schooling at Therbow School in PZ, Sabon Gari, Zaria (2007–2011), where he was honored at graduation as an outstanding and peaceful student.
• During senior secondary studies at Therbow School, a dispute arose over school regulations requiring students to shave their beards. Sayyid Mahmud declined on religious grounds, maintaining that Islamic principles guided his personal appearance. Despite appeals, including an intervention by Professor Abdullahi Danladi on his father's behalf, he was expelled in his final year and subsequently completed his secondary education at Bethel School near the Aviation area between 2011 and 2012.

During a transitional year in 2012–2013, Sayyid Mahmud deepened his studies in Islamic and secular sciences under several prominent scholars in Zaria, including Shaykh Ibraheem Aqilu, Malam Mujitaba Rabi'u, the late Malam Sa'adu Ma'azu City, Malam Abdulazeez Geidam (Aliaziz Kacalla), Tahir Ibraheem Gwarzo, Malam Ibraheem (Physics) at Al-Huda Huda College, Malam Kabiru Ado, and Malam Kabiru Abbas. Shaykh Ibraheem Aqilu in particular devoted substantial time to fostering his intellectual and theological development.

Alongside his studies, Sayyid Mahmud led the Sayyid Abul Fadl al-Abbas media unit, coordinating recording, editing, and distribution of audio-visual lectures and addresses by his father. Known for his mild temper, warm demeanor, and religious scrupulousness, peers frequently consulted him on matters of Islamic jurisprudence, which earned him the nickname Shehu.

In 2013, Sayyid Mahmud traveled to Lebanon to pursue higher Islamic studies at Al-Mustafa International University in Beirut. His advanced preparation allowed him to skip introductory levels and join senior classes, earning the admiration of both instructors and international peers for his scholarly capacity and affable character.

In July 2014, Sayyid Mahmud returned home to Zaria for his academic vacation. His visit coincided with the annual International Quds Day procession, held in solidarity with the Palestinian people. On Friday, 24 July 2014, he participated in the procession, operating media cameras near Kubanni Bridge. During the gathering, Nigerian military forces deployed to the area opened fire on the demonstrators. Sayyid Mahmud sustained severe gunshot wounds to the lower abdomen.

He was transported from the scene by comrades and moved to the Husainiyyah Baqiyyatullah medical point, where volunteer medical personnel led by Dr. Mustapha attempted emergency resuscitation. He succumbed to his injuries that afternoon. His mother, Malama Zeenatuddeen, reached the clinic amid ongoing tension to bid him farewell before his body was brought home, where news soon followed that other brothers detained by security forces had also been killed.

“All praise belongs to Allah. You returned to receive martyrdom; had I known this was your farewell, I would have embraced you and breathed in your fragrance once more before you departed.”