The stabbing death of a 22-year-old woman early Thursday, allegedly at the hands of her younger cousin, followed a scrap inside a Decatur Street club that was broken up before the victim rekindled the aggression a block up the street, according to a police account.

The suspect, 20-year Dannisha Green, surrendered to New Orleans police on Monday and was booked on a count of second-degree murder in the slaying of Brittany Seymour, 22.

Magistrate Commissioner Brigid Collins set bail for Green at $150,000 late Monday.

Eighth District officers found a knife at the scene and an unresponsive Seymour when they arrived in response to the 1:17 a.m. call, according to an affidavit by NOPD homicide Detective Brett Mathes.

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The detective interviewed two witnesses, including a close relative of Seymour, who described the bar fight. Both witnesses said they left the bar with Seymour.

The first witness said that after the brawl inside the House of Blues, Seymour re-engaged Green in the 300 block of Decatur. She "grabbed Green by the hair with both of her hands," the witness told the detective.

"Green had the victim by the hair with one hand, and was striking her in the abdomen area with her other hand," Mathes wrote.

The second witness also described the bar fight and the scene outside, where she said Seymour "again engaged in a fight" with the same person. That witness said she didn't know Green by name, but she picked Green out of a photo lineup, according to police.

The first witness said Seymour and Green had "an ongoing disagreement over an ex-boyfriend," Mathes wrote.

That account echoed a statement from Seymour's mother, Kimi Seymour, who said Brittany ran into Green while out celebrating her recent birthday with her sister and a friend.

Kimi Seymour said she understood that her daughter and Green then started arguing over Seymour's ex-boyfriend, a sore subject between the two.

The founder of the nonprofit Project NOLA security camera network captured footage of Green and Seymour beginning to argue on Decatur shortly before the stabbing, organization founder Bryan Lagarde said Monday.

Green's attorney, Jeffrey Smith, said the police affidavit downplays the intensity of the brawl inside the club and the crowd outside.

He said Green left the club with her shirt ripped off and her breasts exposed.

"She was looking to get to the car and get out of there" before Seymour came for her, he said.

"There's a whole lot more to this story," Smith said, describing "a tremendous amount of animosity" and a history of "aggressive and violent threats toward (Green) in the past."

Smith described the crowd around the fatal fight as "a mob scene."

Smith did not assert a self-defense claim on his client's behalf, saying it was still unclear who stabbed Seymour.

Neither of the two witnesses described seeing Green stab Seymour.

Follow John Simerman on Twitter, @johnsimerman.