Police are investigating after the incident on David Street on Wednesday.
Officers were called to a property there where they found the 25-year-old man alive, but he died shortly afterwards.
An investigation is now underway to piece together just how he died, but police say his death is currently unexplained.
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A Police Scotland Spokesperson said: “Officers were called to a property on David Street in Kirkcaldy, at around 1.15pm on Wednesday, December 25 after a 25-year-old man was found with serious injuries.
“He succumbed to his injuries a short time later.
“Inquiries are ongoing to establish the full circumstances surrounding his death, which is currently being treated as unexplained.
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