Casting for NBC’s potential Chicago Fire spin-off is heating up.

TVLine has learned exclusively that Lost actress Tania Raymonde has been cast in the planted offshoot, which will revolve around the Windy City’s police department.

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The new characters — including Raymonde’s officer, Nicole — will be introduced in Chicago Fire‘s May 15 Season 1 finale, which will serve as a pilot of sorts for the potential new series.

Executive producer Dick Wolf, who’s had past successes with franchise extensions (Law & Order, Law & Order: SVU, Law & Order: Criminal Intent) for the Peacock Net, will reportedly helm the spinoff with Chicago Fire creators/executive producers Derek Haas and Michael Brandt and executive producer Matt Olmstead.

It remains unclear which, if any, Chicago Fire cast members might jump ship to the police-focused series.