PHILADELPHIA — A corrections officer at Chester County Prison warned staff that Danilo Cavalcante was preparing to escape weeks before he broke out, according to county officials. “I am just sending this cause I don’t want this to come back on us or [Officer Gerardo] Hernandez in any way. He noted back in July that this inmate was planning an escape,” Sergeant Jerry Beavers wrote in an email to Captain Harry Griswold hours after Cavalcante escaped on Aug. 31 by crab-walking up the prison’s wall onto its roof. The email was first reported by ABC News. Cavalcante — who had been sentenced to life...