The Brighton man shot to death in his own apartment was identified in court today as 78-year-old William Thomas, and his alleged killer was held without bail after his arraignment today, Suffolk County District Attorney Daniel F. Conley said.

RANDY FLOYD MOORE (D.O.B. 11/13/56), a resident of the same building in which Thomas was shot dead, was formally charged in Brighton District Court with Thomas’ murder and two counts of armed assault with intent to murder for allegedly firing on Boston Police officers during the standoff that followed.

Assistant District Attorney Mark Hallal, chief of Conley’s Senior Trial Unit, recommended that he be held without bail and Judge Franco Gobourne granted that request.

Boston Police responded to the John Carroll Housing Complex, which serves elderly and disabled residents, at about 10:45 yesterday morning for a report of shots fired at 17 Ledgemere Road, apartment #58, Hallal said.

On arrival, officers found Thomas seated in a wheelchair just inside the entrance to the apartment, suffering from a large gunshot wound to his chest. They also spoke to a witness who said he heard the door to the defendant’s apartment – almost immediately above the victim’s apartment – open just before the shooting. The officers began treating Thomas as best they could until emergency medical technicians arrived.

“As the officers approached the rear door of apartment #60 to secure the scene, the defendant fired multiple rounds through the door at them,” Hallal said. “The rounds went through the door and right by the head of one of the officers.”

The EMTs told police that Thomas had to be transported to the hospital immediately in order to survive his injury, Hallal told the court.

“Accordingly, the officers in apartment #58 escorted the EMTs and the victim out to a waiting ambulance with their weapons drawn,” Hallal said. “As they were escorting the victim out the door, the defendant fired additional rounds at the officers.”

Thomas was raced to Brigham and Women’s Hospital, where he succumbed to his injury.

Hallal told the court that Floyd then “barricaded” himself into his apartment and refused to come out. Boston Police deployed SWAT and negotiation teams to the scene and, as a precaution, evacuated the complex.

“A negotiator was able to engage the defendant on the phone for approximately two hours and repeatedly urged him to surrender and lay down his weapons,” Hallal said. “The defendant was apprehended at approximately 1:00 p.m. as officers moved in toward the door of the defendant’s apartment.”

Hallal said a shotgun believed to have been used during the incident was within plain sight inside the apartment at the time of Moore’s arrest, along with “numerous” live and spent shells and pellets.

Hallal recounted Floyd’s criminal history, which included a 1977 continuance without a finding for abandoning a motor vehicle in East Boston, a 1992 continuance without a finding for operating under the influence in Chelsea, and a 1995 conviction for the same offense in Peabody.

Attorney Matthew Kamholtz represents Moore, who will return to court on Sept. 9.