(CNN) -- A Harvard-educated former biology instructor will stand trial beginning March 19, 2012, in the shootings at a northern Alabama university that left of three of her colleagues dead and three wounded, her attorney said Thursday.
In an arraignment Thursday before Circuit Court Judge Alan Mann in Madison County, Alabama, Amy Bishop entered a plea of not guilty by reason of mental disease or defect, defense attorney Roy Miller told In Session, a sister network of CNN.
Bishop, who taught at the University of Alabama-Huntsville, is charged with three counts each of capital murder and attempted murder in the February 12, 2010, shootings, which occurred during a biology department faculty meeting.
She also has been also charged in Massachusetts with murdering her brother, Seth, in 1986. Her brother's shooting originally had been ruled an accident, but the case was reopened after the Alabama shootings.
A judge in March 2010 placed a gag order on attorneys and as law enforcement personnel prohibiting them from talking to the media about the case.
In Session's Carol M. Gantt contributed to this report.