An author did not violate copyright law when he used facts from a previously published book in his own work about a triple murder, a federal appeals court held Thursday.The 7th U.S. Circuit Court of Appeals declined to revive a lawsuit accusing Robert L. Snow of infringing on Carol Sissom’s copyright of “The LaSalle Street Murders.”Snow acknowledges that he relied heavily on Sissom’s book for information about the investigation she conducted into the Indianapolis slayings, the court noted.However …