Osho (Rajneesh) died on January 19, 1990, at the age of 58. The official cause of death stated was heart failure. However, there are many suspicions and theories surrounding his death, including possible poisoning. Some of his followers and insiders believe that he was slowly poisoned, potentially with thallium or other substances, possibly during his incarceration in the US, which led to a gradual physical deterioration. Others suspect foul play as a motive linked to control over his substantial estate. The exact cause remains uncertain, with some accounts noting unusual symptoms and the hurried cremation of his body soon after death.