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After the series ' cancellation , Ken Olin joined Hill Street Blues cast in the fall of 1984 and Mykelti Williamson appeared in a recurring role .
 Ken Olin, Mykelti Williamson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ken Olin, Mykelti Williamson