A man was fatally stabbed during a brawl in the middle of a Manhattan street Friday morning, cops said.

The fight broke out just before 8:15 a.m. in the crosswalk at West 29th Street and Seventh Avenue in Chelsea, where New Yorkers casually walked between the two men as they squared up to each other, according to cops and video of the incident.

Moments later, the shirtless 36-year-old can be seen in video bleeding in the crosswalk with cops frantically trying to save the man’s life.

EMS rushed him to Bellevue Hospital where he died.

The other man, age 34, was taken into custody, cops said.

It was unclear what sparked the violence.