Justine Damond, 40, went outside in her pyjamas after police arrived and was shot through the door of a squad car by an officer seated inside the vehicle, it was claimed.
The officer's body camera was not turned on at the time, raising questions from the woman's family and Minneapolis' mayor.
Ms Damond was killed outside the home she shared with her fiance, Don Damond, and was preparing for their wedding in August.
The bride-to-be, who used her fiance's surname despite not yet being married, wrote online that she was working as a spiritual healer and meditation coach, but was also a trained veterinarian.
Ms Damond was fatally shot in an alley behind her home at about 11.30pm on Saturday night.
Dressed in her pyjamas, the woman was talking to an officer in the driver's seat of the police car when the officer in the passenger seat pulled out his gun and shot her through the driver's side door, sources told the Star-Tribune.
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link to www.msn.com]