[Actually, homicide is defined as "the deliberate and unlawful killing of one person by another".]
I think you are confusing Murder with Homicide.  Full disclosure, criminal law isn't my bailiwick but homicide is a greater category which includes both deliberate (or malicious) unlawful killings of a person and accidental/reckless unlawful killings.  Basically, Black's law dictionary defines it as "a killing of one person by another."  This includes excusable homicide (soldiers in a combat zone or police officers "good shoot") and justifiable homicide (typically self-defense).  Murder and voluntary manslaughter requires an element of deliberate/intent while Criminally Negligent Homicide and Manslaughter (which can be intentional but also grossly indifferent/reckless) do not.
AK Manslaughter statute:
http://touchngo.com/lglcntr/akstats/Statutes/Title11/Chapter41/Section120.htm