The Brooklyn District Attorney’s Office has chosen not to pursue homicide charges against a man who asserts he acted in self-defense during a violent altercation with a friend in a Crown Heights apartment, according to a senior police official on Tuesday.

The 58-year-old man alleged self-defense after a 56-year-old man forcefully entered the apartment and began attacking him on Monday, inside a three-story building on Troy Ave. near Park Place, according to law enforcement sources.

The accused then fatally stabbed the aggressor with a kitchen knife. With his hands stained with blood, the accused hurried to the 77th Precinct stationhouse at approximately 3:15 a.m., where he informed police officers that he believed he had just killed his friend in an apartment.

The suspect, who has 16 arrests on his record, had bloody hands and cuts, a source added.

Police officers quickly arrived at the crime scene, where sources reported finding bloodied footprints outside the apartment. Inside, they discovered the victim lying face up, with stab wounds on his chest and arms. Emergency medical personnel pronounced the victim deceased at the scene at 3:27 a.m.

The bloody kitchen knife was found at the scene and a pair of scissors may have also been used.

The victim also had prior arrests on his record, sources said.

It was not immediately clear who lived in the apartment or what sparked the attack.

No charges have been filed. Asked for comment, a Brooklyn DA spokesperson said, “This case is under an ongoing investigation.”