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Originally scheduled for April 8 , 1968 , the 40th Academy Awards ceremony was postponed for two days , because of the assassination of Dr. Martin Luther King , Jr. .
 Martin Luther King , Jr.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Martin Luther King , Jr.