Fox's long-rumored Prison Break spinoff is taking on its own shape. Executive producer Matt Olmstead and co-executive producer Zack Estrin said Monday that they've ditched their previous plan to introduce a female character in the regular series and then spin her off into a separate show set in a women's prison. Instead, they're planning an entirely new series under the Prison Break brand, according to The Hollywood Reporter.

"We had trouble casting for it ... then the strike happened," Olmstead said during Fox's portion of the Television Critics Assn. summer press tour. "By the time we resumed the season, we decided to scrap that idea of doing it that way. We're in the homestretch of writing it."

Estrin added, "This is more like a "CSI: NY" -- more of a brand spinoff than a character spinoff."

The working title remains Cherry Hill (possibly Prison Break: Cherry Hill), and it's still set in a women's prison.