A D.C. Superior Court Judge Friday ordered a Northeast Washington man held in D.C. jail on charges that he fatally shot a brother and sister following an argument this summer.

Magistrate Judge Karen Howze ordered Kevin A. Walker, 38, held on two charges of first-degree, premeditated murder in the July 20 fatal shootings of Jamie Jenkins, 28, and her brother, Jamahl, 21.

Court documents reveal new information about the shooting that left the siblings dead. According to one witness, Walker’s live-in girlfriend and Jamie Jenkins had been fighting in front of Walker’s apartment in the 5300 block of East Capitol Street NE at around 4:30 a.m.

Walker’s girlfriend, according to court papers that cite an unidentified witness, headed inside and said she was going to get a gun. Inside the apartment, Walker told his girlfriend that he would take care of things and took the gun and came outside.

Walker approached the siblings and said “I don’t pull my gun out unless I’m going to use it,” according to court papers. Jamie Jenkins, according to the documents, jumped in front of her younger brother and was shot in the head. Jamahl Jenkins attempted to turn and run and was shot six times in his back.

It is unclear why the women were fighting. Family members had said earlier that Jamie Jenkins had called her brother after her purse was snatched following a performance with a local R&B band in which she was a singer.

Walker was arrested last month at a relative’s home in North Carolina and was extradited to Washington for his initial court appearance.

Assistant U.S. Attorney Magdalena Acevedo argued Walker “assassinated two people.” But Walker’s attorney, Dana Page of the District's Public Defender Service, said the witnesses account were not credible and that her client had no prior arrests and should be released.

But the judge said she found enough evidence to consider Walker a danger and ordered him held. Walker's next hearing is scheduled for Oct. 25.