A man was stabbed to death and a woman was seriously injured in a street fight in Harlem this morning that apparently broke out over an umbrella.

Police say that the incident happened just after 8 a.m. on Friday in front of a McDonald's at 125th Street and Lexington Avenue. They say that a couple—a 46-year-old male suspect, who has since been identified as Jesus Santiago, and his 36-year-old girlfriend—were involved in an argument with another couple, an unidentified man in his 30s and a 46-year-old woman.

The Daily News has video of the fight, which you can see below. In it, you can see the two women struggling with the umbrella, before a man in Army fatigues, believed to be the unidentified victim, jumps in holding a knife.

Santiago allegedly joined the fight after that and took out a box cutter. Both the unidentified man and the 46-year-old woman were stabbed multiple times in the torso. They were taken to Harlem Hospital; the man was declared dead there, while the woman is in critical condition.

Santiago and his girlfriend were both arrested; the box cutter was recovered at the scene. The charges are pending and the investigation is ongoing.