sentences:  The cause of death was determined to be a gunshot wound to the back of the head, performed from a Makarov PM handgun while she was in kneeling position.According to the Committee to Protect Journalists, the killing may have been work of Russian federal troops angered at her work, in particular the filming of Samashki, or might have been ordered by the Chechen rebels acting on rumors spread by the Russian FSB security service that she was a spy.The federal government never investigated the murder, as the criminal inquiry was soon halted by the federal Russian prosecutor's office "for lack of evidence and substance of a crime."