" FBI files, made public after years of lawsuits, reveal the extent of the Nixon Administration's efforts to "neutralize" Lennon. (However, while ominous in tone, the term "neutralize"--as used by government agents--was never really defined.) With FBI Director J. Edgar Hoover at the helm and reporting to the Nixon White House about the FBI's surveillance of Lennon, memos and reports had been flying back and forth between senators, the FBI and the U.S. Immigration Office. Clearly forces were at work to "neutralize" Lennon. "
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http://www.rutherford.org/articles_db/commentary.asp?record_id=565
Regards...
Considering the darkness of Richard Nixon's soul and the paranoia that gripped the man day and night, there are few evil scenerios that could be relistically dismissed.
However, the fact that the man left the presidency in disgrace well over six years before John Lennon was gunned down, in addition to a dubious case for motive, makes his participation in the murder doubtful, at best.