A week ago, county officials said Evans-Dumaran, who was with the Maui Fire Department for three years, was "slowing making positive and promising signs of progress."
But his family confirmed he died Saturday morning, the county said.
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A Hawaii firefighter died after being swept into a storm drain while responding to a call in Maui on Saturday.
The county released a statement from his mother, Chelsie Evans, thanking the community for an "outpouring of love."
As of Monday, a GoFundMe page for the firefighter raised more than $136,000.
"My heart tells me that Tre’ wants to say thank you for loving his family, his fire ’ohana, his friends during this time," his mother's statement said, using the Hawaiian word for family. "He’d want people to keep giving blood, to keep doing your part as a hero, in the way he lived every day on Earth."
The county didn’t release additional details about what happened to him.
"We’re especially devastated by the turn of events," Maui County Mayor Richard Bissen Jr. said in a statement. "My heart was broken by the news. Every day our emergency responders put their lives at risk to help others, looking out for the community they serve."