There is a dispute about the exact circumstances of Rwigyema's death; the official line of Kagame's government was that Rwigyema was killed by a stray bullet. Historian Gérard Prunier states that he had established "from incontrovertible evidence (including an interview with an eyewitness to the killing)" that Rwigyema was killed by his subcommander Peter Bayingana, following an argument over tactics, and excused his readers for having accepted the "cooked version of facts [the RPF] provided" him with.
There is disagreement about the precise circumstances of Rwigyema's death; Kagame's government asserted that he was killed by a stray bullet, while historian Gérard Prunier contends that he was murdered by his subordinate Peter Bayingana following an argument over tactics and that Prunier has "incontrovertible evidence" to support this claim.