Last August, a middle-aged Russian woman with her face covered walked onto Red Square in Moscow and, in the shadow of the Kremlin, scattered handfuls of coloured rubber balls on the cobblestones below.

Sunday marks one year since the sudden death of top Russian opposition leader Alexey Navalny in his arctic prison. VOA Russian looks back at how the investigation into what happened has stalled over the past year with no new leads or information available.