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There are questions surrounding who actually shot him. The man who went to prison for it may have been set up, as he denied personally shooting Dr. King.

MLK was planning a huge "live in" on the National Mall to pursue greater income equality and there were plenty of interested parties that would have wanted to prevent that.

[OstiaAntica]

Actually the shooter initially pled guilty. Dept. of Justice looked at these "questions" and concluded they are junk.

http://www.justice.gov/crt/about/crm/mlk/part2.php#over

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I bring it up only to mention that it is perhaps not so cut and dry who shot MLK...