Third (3rd) degree: killing that resulted from indifference or negligence. Usually there must be a legal duty (parent - child), but can also include crimes like driving drunk and causing a fatal accident.
First degree: killing with the intent to kill. Usually requires premeditation. Also includes felony murder - an unplanned murder that occurs during the commission of a felony (example is defendant burglarizes a house and during the burglary kills the homeowner - no premeditation but committed during a felony).Second degree: killing with the intent to do harm but not the intent to kill. Example - shooting someone in the leg with the intent to wound but not kill, and the victim bleeds to death.Third degree: killing that resulted from indifference or negligence. Usually there must be a legal duty (parent - child), but can also include crimes like driving drunk and causing a fatal accident.Fourth degree: felony murder committed by an accomplice. Same as felony murder, but instead of one burglar there are two. Burglar A kills the homeowner and that is first degree murder. Burglar B did not take part in the killing but did take part in the burglary and that is fourth degree.
manslaughter. The unintentional killing of another possibly through neglect and negligence. Does not involve the same elements as murder1. Perhaps it was done under a spur of the moment, "hot blood". Like a guy catches his wife with another in a compromising position. Does not have a wilful intent, a criminal mind. Mitigating circumstances.