Recent rumblings surrounding the arrival of a few DC comics characters making their way to Supergirl season two
teased that the show could be introducing its own take on Maggie Sawyer, a police officer who was the one-time fiancé of Batwoman
. But good news! Those rumors were true, and Maggs is heading to National City.
Source: io9 – Supergirl Has Found Its Maggie Sawyer