86fb992a_Grand_Theft_Wiki__the_GTA_wiki__Reward_for_sparing
[Mission] That Special Someone [Target] Darko Brevic [Description] Darko is brought to the airport and in front of Niko with his hands handcuffed. Niko can shoot him to kill him or just walk away to spare him. [Reward for sparing] 
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Choices in GTA IV - Grand Theft Wiki, the GTA wiki