Artbrooks: Here's the legal definition from Nolo.com (http://www.nolo.com/dictionary/homicide-term.html;jsessionid=161799B1DE2632A87898C8ABF22340CF.jvm1):

"Homicide: The killing of one human being by the act or omission of another. The term applies to all such killings, whether criminal or not. Homicide is noncriminal in a number of situations, including deaths as the result of war and putting someone to death by the valid sentence of a court. Killing may also be legally justified or excused, as it is in cases of self-defense or when someone is killed by another person who is attempting to prevent a violent felony. Criminal homicide occurs when a person purposely, knowingly, recklessly, or with extreme negligence causes the death of another. Murder and manslaughter are examples of criminal homicide."

So, yeah, negligent homicide. Of course, Ted Kennedy was not convicted of anything more serious than "leaving the scene of an accident after causing injury" (whereupon he received a two-month suspended sentence) because he was Ted Kennedy.