The unidentified 20-year-old woman from Westport, Conn., broke both her ankles and a wrist and was in stable condition at Beth Israel Deaconess Medical Center (search), according to police. Hospital spokeswoman Cindy Whitcome said no further information on her condition was being released.
A witness described seeing the woman, who is reportedly from Connecticut, climbing into the rafters above the ballpark's right field grandstand.
"I don't know how she got up there," Sean Mahoney, 38, told the Boston Herald, "but I kept yelling for her [to], 'Go back. Go back."
Other witnesses said she was in the rafters for some time before she fell.
"She sat for at least three songs, just dangling there," Jaime Whitney, 29, from Watertown, told The Boston Globe. "She was hanging onto the rafters, sitting on a beam. She just fell backwards."
Firefighters were sent to help her down but they arrived too late, Boston Fire Lt. David Pfeil said.
"Before they could get to her, she fell," Pfeil said.