Who killed Joseph Stalin ?

just a few years ago a discovery was made Stalin was murdered. Stalin ingested warfarin, a powerful rat poison that inhibits coagulation of the blood and so predisposes to hemorrhagic stroke. since it is flavorless, warfarin is a plausible weapon of murder. the fats of stalin's death, however , will probably never be known with certainty. who did it? that is the question you have to answer. possible suspects include: lavrenty beria, georgi malenkov, nikolai bulanin, nikita khrushchev, vasily dxhugshvili (stalin's son ),vyacheslav molotov,and svetlana iosifovna dzhugashvili (stalin's daughter)