State Police are investigating a crash on the Southeast Expressway in Boston that killed a 27-year-old Braintree woman early Thursday, officials said. Alycia Rice, the driver and sole occupant of the vehicle, swerved to the left and crashed into a concrete barrier at 3:09 a.m., State Police said. She was extricated from her 2013 Hyundai Accent by Boston firefighters and taken to Boston Medical Center. She died of her injuries shortly thereafter, said Trooper Todd Nolan, a State Police spokesman.Catalina Gaitan can be reached at email@example.com. Follow her on Twitter at @catalina_gaitan.