Police Woman wasn't really breaking any new ground when it premiered on NBC in 1974. More than 2 decades earlier, there was Decoy, with Beverly Garland, but that had long been lost to the mists of time when NBC green-lighted this entry from executive producer David Gerber and Columbia Pictures Television (now Sony Pictures Television).
The series was a showcase for Angie Dickinson, who played the title role as Sgt. "Pepper" Anderson, an undercover detective. Essentially, this was the template that would get tweaked by Aaron Spelling when he introduced Charlie's Angels 2 years later, except that the three Angels were now working for an independent private eye to do their undercover assignments. Police Woman lasted 4 seasons, and enjoyed an all too brief run in syndication in the early 80's. During the mid-80's, Dickinson would make a comeback with the short-lived Cassie & Co., which was one of the first primetime shows packaged by late night icon Johnny Carson's production company, but it lasted just 1 season.
David Gerber came over to Columbia from 20th Century Fox, where he'd produced sitcoms like Nanny & The Professor a few years earlier. Gerber was also responsible for Police Story, among his other accomplishments at CPT.
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These days, Police Woman isn't airing anywhere, and that's a shame, as the series marks its 40th anniversary this year.