FX has given a 10-episode order to a true-crime series from Ryan Murphy that will serve as a companion to his “American Horror Story” franchise, with the first installment focusing on the O.J. Simpson murder case.

“American Crime Story: The People Vs. O.J. Simpson” will be based on “The Run of His Life,” the account of the 1994 Simpson murder saga authored by Jeffrey Toobin.

Murphy and his “American Horror Story” partner Brad Falchuk will spearhead the series for FX Prods. and the Fox 21 imprint of 20th Century Fox TV. Screenwriters Scott Alexander and Larry Karaszewski have adapted Toobin’s book and penned the first two episodes. The pair will exec produce with Murphy, Falchuk, Nina Jacobson and Brad Simpson. Dante Di Loreto, a frequent collaborator of Murphy and Falchuk, is also on board as exec producer.

“Scott and Larry have adapted Jeffrey Toobin’s book into a masterful 10-hour piece,” said FX Networks CEO John Landgraf. “I have no doubt that Ryan and his partners, Nina Jacobson, Brad Simpson, Brad Falchuk, and Dante Di Loreto are going to make something very memorable here – and that it will be a spectacular first entry in what is destined to become a series of great true crime-based miniseries.”

Murphy is expected to direct at least the first episode of the series. Production will begin early next year, FX said.

“The O.J. case was as tragic as it was fascinating – it seemed like everyone had a stake in the outcome. It was really the beginning of the modern tabloid age,” Murphy said.

FX said the plan is for “American Crime Story” to tackle a different crime story each season, just as “American Horror Story” changes focus and many cast members each season.

“When Ryan has passion for a project, our entire company is energized by his enthusiasm and spectacular talent,” said Fox Television Group chairmen-CEOs Dana Walden and Gary Newman. “Nothing is more exciting than starting a juicy, new franchise with him, and the team behind-the-scenes is top-notch – a ‘dream team’ that rivals any ever assembled.”