The legal term manslaughter refers to the killing of a person with without premeditation. For a case to be a murder, there must be a proven intent to kill.
There are two kinds of manslaughter, voluntary and involuntary. Involuntary manslaughter is when a person is killed because of a non-felony activity, like impaired driving. Voluntary manslaughter occurs when a person is killed by the activity of another, when the perpetrator is unarmed. If the perpetrator was armed with a gun, the charge would likely be murder.http://dictionary.law.com/Default.aspx?selected=1209