Pratt has replaced original showrunner Murray, who recently departed "Star" because his vision for the series differed from that of Daniels and co-creator Tom Donaghy.
Sources say the split was amicable, according to The Hollywood Reporter.
Daniels co-wrote the pilot with Donaghy for the Atlanta-set drama which centers on three girls (newcomers Jude Demorest, Ryan Destiny and Brittany O'Grady) who form a band.
While Daniels' other Fox music drama, "Empire", is told from the perspective of music executives, "Star" focuses on the artist's point of view as the series details the trio's rise to the top in a tough business.
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