Reports in the US show a mystery cyclist filmed part of the encounter between Justine Damond and Minneapolis Police, just moments before she was shot and killed.
Footage has not been released, but it does offer police a potential breakthrough in the investigation.
Authorities announced on Friday they had identified and interviewed a male cyclist who was spotted at the scene.
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The police involved in the shooting were heavily criticised for not having their body cameras or dash cam on when they were called to an ally behind Damond’s house.