Ms Damond had called 911 to report a woman being raped close to her apartment block shortly before she was shot and killed.
Friends, family and community members gathered Friday night at the Lake Harriet Band Shell to celebrate her life.
Her fiance, Don Damond, who shared a sample of Justine's writing with the crowd said he had, "immense gratitude for being the one she chose".
It has been nearly one month and it is still very emotional for a lot of people.
The 40-year-old former vet loved blue mourners have been asked to wear the colour to her memorial
The father of an Australian woman shot and killed by a Minneapolis police officer choked back tears at her public memorial service as he talked about the pain of the loss of his daughter, Justine Damond.
Many of those gathering at Lake Harriet Park in southwest Minneapolis for the sunset memorial wore blue, Ruszczyk's favorite color. People will also be able to write some special messages to her.
The single bullet struck in her in the abdomen at the drivers window.
Officer Matthew Harrity told investigators that he drove to the scene and was startled by a "loud sound" near the squad vehicle, according to Minnesota's Bureau of Criminal Apprehension.
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The Minnesota Bureau of Criminal Apprehension is investigating the shooting.
'I can just feel her basically saying "why are you guys being so serious?",' friend Rosie McGowan said.
Her father said Ruszczyk coined the term "fuzz therapy" to describe the joy she got from animals.
Though the officers were wearing body cameras, they did not turn them on before the shooting, and the squad vehicle camera did not capture the incident, investigators said.
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The two officers had not activated their body cameras. Harrity was interviewed by the agency but Noor declined and, under state law, can not be compelled to be interviewed.
Ruszczyk's death has caused outrage in the United States and Australia and led to the resignation of the city's police chief.
Justine Damond's American fiancee Don and their friends and family should have been heading for a wedding in Hawaii.
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