Maggie comes from a multigenerational law enforcement family in the Midwest. Special Agent Bell brings her unique skills to her job where she commits deeply to the people she works with as well as those she protects.

Bell was a police officer in Indiana who was recruited to the FBI after working a joint kidnapping case. At the beginning of the series, it's said that she's been working in NYC for three years. 

Maggie's husband, Jason, an investigative reporter, was killed while investigating a story.