Mexican cartel leader dies in shootout after mass jail breakMEXICO CITY, Jan 5 (Reuters) - An escaped Mexican cartel kingpin known as "El Neto" died after a shootout early on Thursday, four days after he fled prison in a violent mass break-out, authorities said.El Neto", whose full name was Ernesto Alfredo Pinon de la Cruz, was tracked down by intelligence forces in the city of Ciudad Juárez on the U.S. border, and then shot after a pursuit, officials said.He was injured, but on the way (to the state attorney general's offices) he died," Chihuahua state governor Maru Campos said on Twitter."El Neto", a top gunman for the "Los Mexicles" cartel, escaped with 29 other inmates after raiders in armored vehicles attacked the prison in the border town of Juarez early on New Year's Day.State prosecutors in Chihuahua said the head of the Juarez prison had been dismissed and was under investigation alongside others."