Joran van der Sloot, the 27-year-old Dutchman who is the prime suspect in the 2005 disappearance of U.S. teen Natalee Holloway, has been stabbed and may be in critical condition, according to a Dutch website. In an interview with a Dutch news outlet, van der Sloot’s lawyer, Máximo Altez, said the convicted killer was stabbed in the shoulder and waist by fellow prisoners. Van der Sloot is currently serving a 28-year sentence for killing a Peruvian business student, Stephany Flores, in 2010. Van der Sloot was recently transferred to the Challapalca Penitentiary located in the Andean department of Puno, known...