James Holmes, the mass-murderer behind the shootings in Aurora Colo., has been barred from the University of Colorado for threatening a professor, only weeks before he opened fire at midnight showing of The Dark Knight Rises premiere. Just minutes before the shooting, he had tried to call his university psychiatrist, whom he had also sent a package containing violent descriptions of an attack. The prosecutors allege that Holmes was furious over the deterioration of his once-promising academic career, and began to stockpile weapons once his professors began encouraging him to choose another profession …