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A man was stabbed to death over the weekend outside his cousin’s girlfriend’s home by the woman’s ex-boyfriend, prosecutors said Tuesday.

Dalashawn Brown, 30, fatally stabbed Reginald Boston, 26, in a gangway outside the home in the 3200 block of East 91st Street about 4 a.m. Sunday in the South Chicago neighborhood, prosecutors said. In a hearing midday Tuesday before Cook County Judge Peggy Chiampas, Brown was ordered held in lieu of $500,000 bail, said Tandra Simonton, a spokeswoman for the Cook County state’s attorney’s office.

Boston was with his cousin outside the home of the cousin’s girlfriend, who was Brown’s longtime girlfriend, before the stabbing took place, prosecutors said.

Boston and his cousin went into a gangway that led to the home when they heard footsteps in the gangway and saw someone walking up, prosecutors said. They asked who it was, and the person replied “Dala,” which is a nickname for Dalashawn Brown, prosecutors said. They saw Brown coming toward them in a green, puffy coat, with his hands in his pockets.

Brown raised his hands to show there wasn’t anything in them and told Boston and his cousin that he was there “for his kids,” according to prosecutors.

Brown has two children with the woman, who had been dating on and off for 10 years, prosecutors said.

The woman came to the door about the same time, and the cousin turned to her for a moment. When he turned back to Boston, the cousin saw Brown pulling back his right arm, which had been extended toward Boston.

Brown ran off and the cousin and his girlfriend found Boston had been stabbed. They took Boston to Advocate Trinity Hospital, and he was trasnferred to Advocate Christ Medical Center, where he was pronounced dead at 7:12 a.m., according to the Cook County medical examiner’s office.

Boston, of the 3500 block of West 74th Street, died from a stab wound to the abdomen, according to the medical examiner’s office.

Brown was arrested later Sunday at his workplace in Crestwood, prosecutors said. He’s due back in court Feb. 14.