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Sheikh Abubakar Shekau, who was killed in May 2021, had been leading the Boko Haram sect since 2010 constantly makes pronouncements that have become of interest to the Nigerian government and the general public, but his idiolect and accompanying linguistic idiosyncrasies have not been studied for the purpose of forensic investigation. Using quantitative and qualitative approaches, this study has examined transcripts of his pronouncements and identified the stylistic devices Shekau uses in the delivery of his sermons and other pronouncements. This work will be of great value to the intelligence and judicial agencies as it would enhance future investigations into the authenticity of pronouncements purportedly made by Shekau.