A Florida beauty school student was fatally shot outside the academic building by a disgruntled ex-boyfriend who had allegedly been stalking her before he killed himself in a “sudden act of violence” on Tuesday. Aileen Martinez, 20, was found inside a white SUV at the parking lot of the Aveda Institute of South Florida in Davie, Fla., just after 2 p.m. when police responded to a shooting steps from the school. Officials said Martinez was targeted by the gunman, who was only identified as a 25-