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Two key members of the Kovalev Commission , Sergei Yushenkov and Yuri Shchekochikhin , both Duma members , have since died in apparent assassinations .
 Kovalev, Sergei Yushenkov, Yuri Shchekochikhin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kovalev, Sergei Yushenkov, Yuri Shchekochikhin