Detective (formerly Lieutenant, Captain) Megan Russert is a fictional character on played by Isabella Hofmann. At the time of her introduction in the premiere episode of the third season, she is a lieutenant who takes charge of the homicide unit's second shift after the previous commander's retirement. Later in the season, a vacancy opens up in the chain of command and she is promoted to captain on a trial basis, as a token of the city's commitment to diversity and equal opportunity.