Portrait of a Killer is a mission in Grand Theft Auto IV. It is given to protagonist Niko Bellic by an unnamed government agent at the United Liberty Paper office in Algonquin, Liberty City.
In this mission, United Liberty Paper wants Niko to kill Adam Dimayev, the Russian owner of an imports/exports company who is financing terrorist activity. Niko Bellic is sent by United Liberty Paper to finish off Adam Dimayev and his goons. Niko goes over to a compound in Dukes. There he kills Dimayev and his goons.
If Adam and all but one bodyguard are killed, the last bodyguard can be spared.