You will hear these terms in discussions of the trial of Conrad Murray for the death of Michael Jackson. Here are some brief definitions:
Homicide: The killing of one human being by another. Distinguish from murder.
Murder: The unlawful killing of a human being by another with malice (express or implied).
Involuntary manslaughter: The commission of an unlawful act, or the commission of a risky lawful act without due caution, which causes the death of another.
Negligence: Omitting something a reasonable person would do, or doing something a reasonable person would not do.
Gross negligence: The intentional failure to perform a duty in reckless disregard for the life or rights of another.
Controlled substance: A substance whose availability is restricted by a federal or state controlled substances act. Under the federal Controlled Substances Act, a controlled substance is placed into one of five schedules based on whether it has a currently accepted medical use, its relative abuse potential, and the likelihood of causing dependence.