Joran van der Sloot, the chief suspect in the May 2005 disappearance of Natalee Holloway, claims his life is under constant threat in prison and there is a $10,000 reward for his death. “I don’t want to die,” the Dutch-born killer of 21-year-old Peruvian Stephany Flores said in a handwritten letter exclusively obtained by Fox News Latino. Van der Sloot is serving a 28-year sentence in the Challapalca prison in Peru, nicknamed the “Alcatraz of Altitudes,” for killing Flores in her hotel room in 2010. While in prison in Lima, Van der Sloot met and married Peruvian Leydi Figueroa and...