"Miss Bishop seemed frightened, disoriented and confused, but she kept both her hands on the shotgun at all times,'' the officer wrote in a police report. "She wouldn't drop the gun.''
The confrontation ended when an officer snuck up behind Bishop and handcuffed her, the report said.
Nevertheless, Bishop's shooting of her brother was deemed to be accidental and she was not charged for any of her actions after the shooting.
The lead prosecutor who would've handled the case at the time, now U.S. Rep. William Delahunt, told the AP today he does not remember the case well.
John Polio, the now-retired police chief who ruled the death an accident in 1986, initially denied there was a cover-up, but on Tuesday said he now has questions about the quality of the investigation.
Bishop also was questioned, and again never charged, in a 1993 attempted mail bombing of a Harvard professor.
Grim new details came out today about what happened during the last Friday's shooting.
Professor Debra Moriarity, who had a lab next to Bishop's and was considered her closest friend on campus, told "Good Morning America" that she pleaded for her life, but Bishop fired at her anyway.
Moriarity, 55, said she dove under the table when the shooting began, crawled under the table and grabbed Bishop's legs, but couldn't make her stop shooting. Moriarity said she then tried to crawl out of the room, but her friend pointed the gun at her.
"I know I yelled at her, 'Amy, think about my grandson, think about my daughter," the Alabama professor told "GMA."
Moriarity said her friend was unmoved by her pleas.
"She stepped out in the hall and pointed the gun at me and pulled the trigger. And it clicked and clicked again. She moved around a little, click," Moriarity said. "I'm here talking to you today because the gun didn't fire."
When Bishop paused, Moriarity scooted back into the conference room and other survivors locked the door and barricaded it with a small refrigerator.
In reliving the terror of that morning, Moriarity said she heard a shot and looked up to see Bishop holding a gun and firing.
"She looked like she was intent on doing this and she was angry," Moriarity recalled.
"She was going to keep on shooting, you could see that," Moriarity said. "She was very intentional and methodical."