Just in case anyone is interested, here are the Black's Law Dictionary definitions of:
Manslaughter: The unjustifiable, inexcusable and intentional killing of a human being without deliberation, premeditation and malice. The unlawful killing of a human without any deliberation, which may be involuntary, in the commission of a lawful act without due caution and circumspection. Criminal homicide constitutes manslaughter when: a) it is committed recklessly; or b) a homicide which would otherwise be murder is committed under the influence of extreme mental or emotional disturbance for which there is reasonable explanation or excuse.
Criminal Gross Negligence: Gross negligence is culpable or criminal when accompanied by acts of commision or omission of a wanton or willful nature, showing a reckless or indifferent disregard of the rights of others, under circumstances reasonably calculated to produce injury, or which make it not improbable that injury will be occasioned, and the offender knows or is charged with knowledge of the probable result of his acts.
Negligence: The omission to do something which a reasonable man, guided by those ordinary considerations which ordinarily regulate human affairs, would do, or the doing of something which a resaonable and prudent man would not do. The term refers only to that legal delinquency which results whenever a man fails to exhibit the care which he ought to exhibit, whether it be slight, ordinary, or great.
Criminal Negligence: Criminal Negligence which will render killing a person manslaughter is the omission on the part of the person to do some act which an ordinarily careful, prudent man under like circumstances would not do by reason of which another person is endangered in life or bodily safety.
A jury will probably have to determine if Mrs. Strange's death constitutes one of the above or if her death was a horrible accident.