A young man was allegedly stabbed to death after he was caught in a bloody brawl near a Brisbane train station.

The body of Lauie Michael Tagaloa, 24, was found at the Valley Metro food court above the Fortitude Valley train station at about 4am on Monday.

A 20-year-old man has been charged with murder, while two other men, aged 20 and 21, who were assisting police with inquiries have been released without charge.