They were getting married next week in Hawaii, and he pointed out the painful irony that the service - held at a lakefront stage near her home in southwest Minneapolis - coincided with the family's original travel plans. "I really had to step up to be at her level".
Damond recounted how his fiancee would get up each morning and free write anything that came to mind, and how she was an inspiration to those around her.
Her fiance, Don Damond, said it "felt like a privilege to love Justine".
Ruszczyk said his daughter was killed by a bullet, that was sacked by an agent of the state, and he will continue to seek justice.
A banner above the bandshell read: "Move from fear and survival to fascination and creation".
Damond says the same sense of love and duty that led her to climb down a sewer to rescue baby ducks also sent Ruszczyk into the alley behind their home late at night on July 15; she wanted to help someone she thought was being sexually assaulted.
'Justine, thankyou for your lovely light that still SHINES on us all, ' one thoughtful sign read.
A judge has approved a search warrant for investigators to examine the smartphones of two Minneapolis police officers in the fatal shooting of an Australian woman last month. Her fiancé, Don Damond, and her father, John Ruszczyk, were among those scheduled to speak at the public memorial.
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The search warrant application was filed Thursday.
The Minnesota Bureau of Criminal Apprehension is investigating the shooting.
Mr Noor's colleague Matthew Harrity told investigators he was startled by a noise just before Ms Damond approached their police SUV.
Justine Damond was killed after making a 911 call to report a possible rape.
Mr Noor was in the passenger seat and shot Ms Damond through the open driver-side window. Harrity was interviewed by the agency but Noor declined and, under state law, can not be compelled to be interviewed.
Those attending are encouraged to honor Justine Damond by wearing blue, one of her favorite colors. Minneapolis police officers are now required to have those cameras on when they respond to calls or make traffic stops.
The service ended with a maypole dance, didgeridoo music from Australia, and a silent walk around Lake Harriet.