First degree murder is a premeditated and intentional killing. Second degree murder is an intentional killing without premeditation. You can skip third degree murder ’cause that’s just a strange statute. First degree manslaughter is a killing that has been committed through the heat of passion, in hot blood in other words. The classic first degree manslaughter case is a man comes home, finds his wife in bed with another man and he kills ’em both. That’s the classic first degree manslaughter case.