With a jury now in place, the heart of Karen Read's retrial is set to begin

Karen Read, the Massachusetts woman charged in the death of her police officer boyfriend John O'Keefe, returned to court in suburban Boston to be retried on charges of second-degree murder and other crimes.

After three weeks of jury selection, a panel of nine men and nine women has been seated in the murder retrial of Karen Read.

Read, whose trial in the death of her police officer boyfriend exposed allegations of law enforcement misconduct, returned to court in suburban Boston this month to be retried on charges of second-degree murder and other crimes.

Read's widely publicized first trial ended with a hung jury last summer.

The heart of the trial is set to begin Tuesday with opening statements.

Here are key dates in the case.