It‘s possible to be killed/attacked by an NPC. In this case character_id, character_name, alliance_id, alliance_name and weapon_type_id will be nil Represents an attacker (attacking a KillVictim) in a Kill Attributes

• id ( Fixnum | NilClass ) - ID of the attacker; nil if the attacker was an NPC or not a Character
• name ( String | NilClass ) - Name of the attacker; nil if the attacker was an NPC or not a Character
• corporation_id ( Fixnum ) - ID of the Corporation that the Character belongs to (could be NPC Corporation!)
• corporation_name ( String ) - Name of the Corporation that the Character belongs to (could be NPC Corporation!)
• alliance_id ( Fixnum | NilClass ) - ID of the Alliance that the Character belongs to (nil if the KillAttacker doesn‘t belong to an Alliance)
• security_status ( Float ) - Security status of the KillAttacker
• damage_done ( Fixnum ) - How much damage the KillAttacker did.
• final_blow ( Boolean ) - True if this KillAttacker got the final blow to kill the KillVictim
• weapon_type_id ( Fixnum | NilClass ) - Type ID of the (a?) weapon the KillAttacker was firing. (Refer to CCP database dump invtypes)
• ship_type_id ( Fixnum ) - Type ID of the ship the KillAttacker was flying. (Refer to CCP database dump invtypes)

See Also: Kill, KillLoss, KillVictim, Reve::API#personal_kills, Reve::API#corporate_kills