Crosbie, 39, who was visiting Boston with the Dublin Fire Brigade to participate in the holiday parade, has pleaded not guilty. At the first trial in June, the jury deadlocked.
Crosbie allegedly raped the 28-year-old woman after she had consensual sex with his roommate, a Dublin firefighter who was asleep in the hotel room’s second bed during the alleged attack.
The other firefighter was snoring loudly while the woman was allegedly being raped, she told the jury last week.
“I’m not sure anything would have woken him up,” she said.
Jacobson said that during the afternoon of March 14, he and the woman ate and drank at a rave they helped plan for their employer. They and a few other coworkers then got more food and drinks at State Street Provisions and the Black Rose pub, where the woman met Liam O’Brien, with whom she later returned to the hotel.
The work rave they had helped organize had been “a huge success” and everyone was in lively spirits, Jacobson said.
The woman told police that she remembered being introduced to multiple members of O’Brien’s group at the Black Rose. One of the men she met, according to video footage, was Crosbie, police said.
On the witness stand on Monday, Jacobson said “it’s very much like” the woman “to make friends anywhere she goes.”
Jurors took notes on pads of paper on Monday, occasionally whispering questions to one another in between witnesses.
Joseph McDonough, a detective with the Boston Police Department, testified that he met with Crosbie on March 16, 2024, to ask him questions about the alleged assault. During their conversation, Crosbie told McDonough that he was scheduled to fly back to Dublin on March 19, he said.
McDonough said he later learned that Crosbie had bought himself a ticket for flight leaving that night at around 10 p.m.
McDonough returned to the Omni Parker Hotel to find that Crosbie had left and “there was no indication that he was coming back,” he said.
O’Brien called Crosbie in the presence of McDonough, but the detective could only hear O’Brien’s side of the conversation.
McDonough learned from other investigators that Crosbie had boarded an even earlier flight departing Logan Airport for Dublin at around 7 p.m.
McDonough and another police officer rushed to the airport and Crosbie was taken off the plane and placed under arrest, he told jurors.
The previous day, after leaving the Omni Parker Hotel at around 2 a.m. on March 15, 2024, the woman went to Massachusetts General Hospital, she told the jury on Friday.
In the emergency room, she consented to give samples as part of a rape evidence kit, medical staff said last week.
On Monday, a forensic scientist in the State Police’s toxicology department testified that she analyzed the woman’s blood samples for alcohol and other drugs.
Her blood alcohol concentration was .135 at 6 a.m. on March 15, when the samples were drawn, Hilary Griffiths testified.
Based on standards for analyzing blood alcohol levels, the woman’s BAC could have been as high as .235 at the time of the alleged rape at around 2 a.m. on March 15, Griffiths said. But it also could have been as low as .155 according to the same “retrograde extrapolation,” she said.
“The effects of alcohol vary greatly from person to person,” Griffiths said, explaining that the rate at which the body metabolizes alcohol depends on a person’s genetics and other factors such as how much food and water they’ve had before and during alcohol consumption.
During both trials, attorneys for Crosbie have emphasized that the woman was intoxicated when she went to the hotel room. On Monday, defense lawyer Patrick Garrity asked Griffiths whether alcohol consumption impairs the brain’s function.
Again, Griffiths said that effects of alcohol vary greatly from one person to the next, and that someone who regularly drinks alcohol will not feel the same effects as someone who rarely or never drinks.
Jacobson answered several questions about how much he and his friend had to drink on March 14.
He said the socializing that he and the woman did that day was an “exciting” time, but that he didn’t notice anything out of the ordinary about what she had to drink.
Claire Thornton can be reached at claire.thornton@globe.com. Follow Claire on X @claire_thornto.
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