Dr. Conrad Murray was Michael Jackson’s personal physician during the time of his death. He was hired to accompany Jackson on his planned London tour in July. Part of his regular duties was to administer the drug propofol, also known as Diprivan, an agent meant to induce general anaesthesia.
Propofol is not meant to act as a sleep aid, and it appears that Jackson had been using it for about two years regularly to help combat his recurring insomnia. However, this use can be considered an act of malpractice, making Murray guilty of criminally negligent manslaughter.
There is really little else to say. Investigators are looking into the identities of other doctors who may have given Jackson propofol while under his employ, but Murray, being the last, is on the hot seat, even though he has not yet been officially charged with anything. It just seems fairly obvious that long-term effects of the drug in question are largely unknown, and so the continued use of it in this manner by a doctor is shoddy work at best. But it also seems clear that there can be little, if any reason for Murray to have killed Jackson outright. With a case this big, authorities might be feeling the pressure to wrap it all up with the first best indication of wrongdoing, so this could turn out to be it.