Shekau, the long-time leader of the extremist group — also known as Jama’atu Ahlus-Sunnah Lidda’Awati Wal Jihad (JAS) — has waged an insurgency in northeast Nigeria for more than a decade.There were multiple reports across Nigerian media Thursday claiming that he had died by suicide rather than be taken alive following clashes with a rival group. Other reports by international news outlets suggested he was either dead or badly wounded.Why can't Nigeria protect its children from Boko Haram?However, it is not the first time that Shekau has been declared dead, only for him to later resurface in videos taunting his detractors. Nigerian Army spokesman Mohammed Yerima told CNN via a text message that the military is “still investigating” Shekau’s reported death.Read MoreSeyi Adetayo, a former officer of Nigeria’s Department of State Services, its secret service equivalent, and founder of intelligence group Eons Intelligence, told CNN that he had heard of Shekau’s death from Nigerian intelligence sources.A still from a Boko Haram propaganda video dated September 25 2016, showing leader Abubakar Shekau, “The military won’t confirm his death publicly because of what has happened in the past. It was embarrassing for the army when they announced he was dead previously. They knew he was seriously wounded at the time but thought he would not survive the injury.”A source close to Boko Haram told CNN he learned Shekau died on Wednesday evening after detonating a suicide vest he was wearing.The source is not involved with the group’s activities but has had close contact over the years with some of its members.The source told CNN that Shekau was traced to his Sambisa forest hideout and asked to surrender and plead allegiance to the Islamic State West African Province, (ISWAP) a group that broke away from Boko Haram in 2016 to align with ISIS.Boko Haram Fast FactsShekau was surrounded by the ISWAP commanders who had disarmed many of the Boko Haram fighters during clashes between the two groups during the Ramadan festivities, the source said. Adetayo added that his death would signal the end of Boko Haram or JAS, which gained international notoriety in 2014 after kidnapping 276 schoolgirls in Chibok, Borno State. Over 100 of the girls remain missing to this day.”It’s an end of an era for JAS but the beginning of a new era. ISWAP is a more formidable enemy. They have a strong international network.”Many of the commanders in JAS were having problems with Shekau before now and some of his commanders defected to ISWAP and gave intelligence to them,” Adetayo said.