The death of POORSTACY -- legal name Carlito Milfort -- was confirmed by the Palm Beach County Medical Examiner ... the Boca Raton Police Dept. told TMZ he died early Saturday in the city. A Boca Raton hotel worker tells TMZ ... POORSTACY was transported to a local hospital for a medical emergency Saturday morning ... he was the only one hospitalized. We're told the rapper had been staying for 10 days at the hotel ... he had checked in with a woman and a toddler. No one else was reported injured