First Degree Murder is any murder that is willful and premeditated.
Felony Murder is typically first degree.[sup]
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Second Degree Murder is a murder that is not premeditated or planned in advance.[sup]
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Voluntary Manslaughter sometimes called a "Heat of Passion" murder, is any intentional killing that involved no prior intent to kill, and which was committed under such circumstances that would "cause a reasonable person to become emotionally or mentally disturbed." Both this and second degree murder are committed on the spot, but the two differ in the magnitude of the circumstances surrounding the crime. For example, a bar fight that results in death would ordinarily constitute second degree murder. If that same bar fight stemmed from a discovery of infidelity, however, it may be mitigated to voluntary manslaughter.[sup]
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Involuntary Manslaughter stems from unintentional, but reckless or criminally negligent behavior. A drunk driving-related death is typically involuntary manslaughter. Note that the "unintentional" element here refers to the lack of intent to bring about the death. All three crimes above feature an intent to kill, whereas involuntary manslaughter is "unintentional," because the killer did not intend for a death to result from his intentional actions.