Marquis Hamilton, the Sebring High School student who died Friday morning, tested positive for the H1N1 flu.
Thomas Moran with the Highlands County Health Department said the results were learned about 3 p.m. Tuesday.
"Our hearts go out to the family," Moran said. "We can't imagine the loss they must feel."
The health department is still awaiting autopsy results from the medical examiner which will reveal why Marquis died, Moran said.
"The H1N1 flu may not have been the cause of death," Moran said.
A press release from the health department is expected soon.

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