Much of the city of Seattle was in mourning on Monday as residents paid tribute to the three lives that were lost during a deadly street gunfight that erupted the day before.

The city's mayor and police chief were among dozens gathered at a local fountain for a candlelit vigil, while online fundraisers for two of the victims received tens‑of‑thousands of dollars in donations.

The three people who died on Sunday at the annual Bite of Seattle food festival were Junior Cee Niko Semo, 19, Carlos Israel Sanchez Villalba, 44, and Ashley Whitehead, 56.

A GoFundMe page for Villalba described him as "a devoted husband, loving father of three, and a loyal friend who would do anything for anyone".

"His kindness and generosity touched countless lives, and everyone who knew him remembers his gentle spirit and willingness to help others," the page says.

"His sudden passing has left his family heart‑broken and facing an uncertain future."

The family said the funds will go toward funeral expenses and help fill the void in his absence; he leaves behind a wife and three children.

Family members of Ashley Whitehead said she was standing in line with her daughter, waiting for cotton candy, when gunshots rang out and ended her life.

She died in hospital during surgery after exchanging heartfelt "I love you's" with her eldest daughter, the GoFundMe page reports.

Whitehead was described as "a lover of life, art and family."

"Family was everything to Ashley — she had recently moved to the West Coast from Alabama to be closer to Zoie," the write‑up says, referencing her eldest daughter.

At the vigil, people laid flowers and lit candles, holding a moment of silence.

"This is not acceptable," Seattle Mayor Katie Wilson said, condemning gun violence in the community. "No father, no parent should have to bury their child."

Police suspect the third deceased victim, Junior Cee Niko Semo, was involved in the gunfight. Another suspect is in custody and a third is still on the loose.

The shots fired on Sunday at the annual food festival near Seattle's Space Needle left three dead and four others injured during a suspected "gunfight," police said.

Sunday was the final day of the three‑day free food festival, which draws about 350,000 people each year.

Washington state Governor Bob Ferguson said on Monday that the community was shocked and "struggling to make sense of how an iconic community celebration could end in gunfire."