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According to the Police the detainee committed suicide.  Colonel JD du Plessis, then Chief of the Kimberley Security Police, explained at the inquest that normally all windows are locked.  On that particular day he and a Mr Van der Merwe had opened a window in Van der Merwe's office to allow fresh air in.  Sergeant Oscar Ntsiko explained that he escorted the detainee from the toilet, when Mabija suddenly broke loose and ran into Van der Merwe's office.  He rushed after him, only to see the detainee crash through the window.   Du Plessis and Van der Merwe were in the office at the time.  The Head of the Security Police in the Northern Cape read from an alleged ANC pamphlet that urged detainees to commit suicide.  Lieutenant CHE van Wyk told the Court that he had instructed Sergeant Ntsiko and Constable MG Matsheka to take Mr Mabija home to fetch a document.
 The deceased's mother Dora Mabija told the inquest court that during his detention her son was taken back home to look for a document.  When this was not found a white detective had said to her son, say goodbye to your family, you will not see them again, Colonel Du Plessis disputed this statement.
 The district surgeon Dr TC Robertson identified a fractured skull as a cause of death.  In addition the independent pathologist, Dr BA Mahler, said Mabija had cuts on his face, hands and liver.  The cuts on his hands could have been caused by  clutching glass.  Lacerations of the liver could have been caused by assault.