(CNN) -- A biology professor charged with killing three faculty members at the University of Alabama in Huntsville fatally shot her brother more than 23 years ago, but she and her mother claimed the shooting was accidental, according to documents released Sunday.





Amy Bishop Anderson was 19 when she fatally shot her brother, Seth, on December 6, 1986, in Braintree, Massachusetts, according to a Massachusetts State Police report released Sunday. She was never charged in that shooting.





Anderson was charged this weekend with capital murder in Friday's on-campus shooting deaths of her colleagues. She could face the death penalty.





The state police report in the 1986 shooting, released by the office of U.S. Rep. Bill Delahunt, D-Massachusetts, gives an account similar to a Boston Globe story published on December 8, 2008. Delahunt was district attorney at the time; staffers said he was in the Middle East on Sunday and unable to comment on the case.





Earlier this weekend, Braintree police said records from that shooting were missing, and that the department's log indicated the shooting was accidental. However, Police Chief Paul Frazier said he didn't agree with the Globe's account.





The Globe's story stated that Anderson asked her mother how to unload a round from a 12-gauge shotgun and that Anderson -- then known as Amy Bishop -- accidentally shot her brother while she was handling the weapon. The article cited then-Police Chief John Polio as the source.





According to the state police report released Sunday, Braintree police told state police that "indications were that Amy Bishop had been attempting to manipulate the shotgun and had subsequently brought the gun downstairs in an attempt to gain assistance from her mother in disarming the weapon" when it went off, shooting her brother, Seth, in the chest.





But, Frazier said Saturday, "it is a far different story I believe than what was reported back then. I cannot tell you what the thought process was behind our releasing her at the time."





An officer then involved in the case who is still working for the department told him that Anderson shot her brother during an argument, Frazier said.





The officer said Anderson allegedly fired a shot in her bedroom without hitting anyone, argued with her brother, shot him and then fired another round in the home before fleeing, according to Frazier.





Frazier said the teen was arrested after pointing a weapon at a vehicle near the house in an attempt to get the driver to stop, but it drove on. But during the booking process, then-Chief Polio called and told the officers to release her, Frazier said. He said her mother was at the time a member of the Braintree Personnel Board.





In a telephone call with CNN, Polio, now 87 and retired, denied ever calling in the order. He said detectives including lead investigator Capt. Theodore Buker -- who has since died -- had interviewed Anderson and her mother, Judith, who is identified in the state police report as J. Bishop.





Buker told him that the shooting appeared accidental and the two men agreed she should be released to her mother, Polio said. A request was then filed with Delahunt's office to conduct an inquiry, but Delahunt never did so, he said.





The state police report, however, said that Buker met with a state police investigator and determined that "due to the testimony of the members of the Bishop family, and in particular the testimony of J. Bishop, relevant to the facts concerning the death of Seth Bishop that no further investigation ... was warranted," the report concludes. Seth Bishop's death was listed as accidental and the investigation was concluded.





Delahunt spokesman Mark Forest told CNN the state police and medical examiner concluded the death was accidental, and an autopsy was also conducted. "The investigative reports ... did not recommend any further action," he said in an e-mail. Those reports were turned over to state and local authorities, including the district attorney's office, he said.





Anderson's mother witnessed the shooting, the state police report said. Investigators waited 11 days to
How many faculty members were killed? was he charged in her brother's 1986 death? What the police chief say? What accuse Anderson? how many faculty dead members was Anderson charged with? What the police said? Who was charged with the killings?
three She he didn't agree with the Globe's account. capital murder three records from that shooting were missing, Amy Bishop Anderson
question: How many faculty members were killed?, answer: three | question: was he charged in her brother's 1986 death?, answer: She | question: What the police chief say?, answer: he didn't agree with the Globe's account. | question: What accuse Anderson?, answer: capital murder | question: how many faculty dead members was Anderson charged with?, answer: three | question: What the police said?, answer: records from that shooting were missing, | question: Who was charged with the killings?, answer: Amy Bishop Anderson