A 33-year-old man stabbed to death during a weekend knife fight inside a Far Rockaway home got into a bloody brawl with his ex-girlfriend’s new beau, law enforcement sources said Monday.

Nilkinson Leonel Medina, 33, was repeatedly knifed in the chest when the melee broke out between the two men around 6:50 p.m. inside the home on Beach 13th Street near Davies Road in Far Rockaway, cops said. 

The woman at the center of the deadly dispute witnessed the violent ordeal, sources said.

Police received a 911 call about the violent fight, but the two men had both fled by the time officers got there, cops said.

The NYPD searched local hospitals and found the gravely wounded Medina at St. John’s Episcopal Hospital, police said.

Medina, who lived less than a mile from the scene, was pronounced dead later that day.

Police are still investigating the stabbing, and no arrests had been made by Monday morning.