Actress Lorraine Toussaint will play Angela Martin, a villainous police chief whom viewers can expect to see in both present scenes and crucial flashbacks.
Here are more spoilers revealed by Toussaint:
"My introduction is timed to the [upcoming] season finale, which is extraordinarily violent and kills off a key character.I am part of the solution to the mystery surrounding Megan's father's suicide. Megan has always thought he was murdered, and it turns out our worlds collided 20 years ago."
Source: TV Guide