Final answer:
Michael Jackson was killed by an overdose of Propofol, a potent anesthetic used for surgery, which highlights the dangers of its misuse outside of professional medical settings.
Step-by-step explanation:
The drug that killed Michael Jackson was Propofol. Propofol is a powerful anesthetic used to induce and maintain general anesthesia or sedation for surgery. It is typically administered intravenously by a professional in a controlled medical environment due to its potency and potential risks. Michael Jackson's case was a high-profile example of the dangers of propofol misuse outside of a medical setting. The use of propofol, combined with other sedatives, led to his tragic death on June 25, 2009.