Two supervisors of a now-demoted Boston police detective will soon be on the internal-affairs hot seat, Commissioner Edward F. Davis said yesterday, as he revealed disturbing new details in the blown probe of a 2012 Roxbury attack linked to the person of interest in the Amy Lord murder.

Davis said he will decide whether to discipline patrolman Jerome Hall-Brewster’s supervisors — a sergeant and lieutenant he declined to name — after investigators interview them and review internal case notes of the vicious September assault on a 21-year-old college student in Roxbury.

“The investigation is ongoing,” Davis told the Herald in an interview yesterday. “The detective’s supervisors are unavailable this week because of vacations. We’ll be having some conversations with them in the near future.”

Hall-Brewster was stripped of his detective’s badge this week after police learned he never followed through on evidence linking 28-year-old Edwin Alemany to the September attack. The victim had grabbed a wallet containing Alemany’s ID from her attacker and later handed them to investigators. Davis said the ID and the victim’s description of the attacker matched enough to constitute probable cause to arrest Alemany.

Davis also disclosed that Hall-Brewster reported visiting the address on Alemany’s ID only once, and that he failed to respond to “numerous requests” to help the police lab in their testing of a hat and water bottle that were taken into evidence at the scene.

“They need to put the evidence that’s been presented to them in context, so it’s really important that there be close conversation between the detective that confiscated the evidence and the laboratory personnel that are doing the tests,” Davis said.

Davis has said previously that cops are reviewing all open assault cases across the city. But he said police are not auditing all of Hall-Brewster’s past cases.

Detective supervisors are responsible for signing off on the status of cases, and have access to notes that detail each step an investigator takes in probing a crime. Bosses are required to review such notes in open cases every 10 days, Davis said.

Thomas Nolan, a former BPD lieutenant and now a criminal justice professor at the State University of New York, said Hall-Brewster “dropped the ball” but “could not have done that in a vacuum.”

“There are mechanisms in place to ensure this kind of case does not fall through the cracks,” Nolan said. “If there is culpability in the lack of response and a lack of accountability, that is a shared responsibility.”

Union reps for Hall-Brewster and his supervisors did not return calls for comment. Hall-Brewster hung up on a reporter who called him last night.

Nolan said attacks like the Roxbury assault are considered the “highest priority” cases for a district detective. Davis called such cases an “extreme priority,” taking precedence over offenses like property crimes.

Police sent Hall-Brewster a letter formally notifying him of his demotion yesterday, Davis said.