After opening arguments from Read’s defense attorney Alan Jackson and the Commonwealth’s special prosecutor Hank Brennan, a key witness was called to the stand.

The second murder trial of Karen Read, whose case has sparked a national debate and won her legions of devoted fans, has begun.

Opening statements in Read’s murder trial will be held Tuesday, more than three years after O’Keefe’s death rocked the town of Canton and launched a sprawling legal saga that has since captured the nation.