Vogel left Kuka for the
Nile Valley, leaving his engineer, MacGuire, with his notes and specimen collections. Vogel got as far as Wadai (also spelled
Ouaddai) in southern Sudan. MacGuire may have known of Vogel's fate but was killed by
brigands while returning to Tripoli. Several search expeditions were organized to ascertain Vogel's fate and to recover his papers, but it was not until 1873 that
Gustav Nachtigal, on reaching Wadai, learnt of the circumstances of Vogel's February 1856 death in Wara, the capital of Wadai. Nachtigal's account was that Vogel's odd habit of existing almost solely on eggs and writing with a
pencil rather than the expected ink was of concern to the
Sultan's advisors who had advised the Sultan to kill him "just in case". The sultan was hesitant but Vogel then climbed Mount Treya which was sacred and off limits to all but the highest officials. Vogel was beaten to death by
Kubartu with iron tipped cudgels. According to Nachtigal,
Kubartu were a Wadai clan consisting of musicians and executioners. ==Family==