Former One Direction singer Liam Payne was so drugged up and acting crazy, a hotel staffer feared the boy bander might harm himself shortly before the star plunged to his death from the third-floor balcony of his room in Argentina. RadarOnline.com can reveal Buenos Aires officials believe the 31-year-old singer, who reportedly promised his $60 million fortune to love child son Bear, 7, was alone in his smashed-up room when he plummeted, fatally cracking his skull on October 16. An autopsy revealed drugs in his system. “My life now is his, my money is his [Bear’s]”, Liam said two years ago. “I …