Another JFK assassination theory

[howela]

http://abcnews.go.com/US/story?id=3902495&page=1

A former Secret Service agent has told WLS-TV there was a plot to kill President Kennedy in Chicago three weeks before he was assassinated in Dallas.

Kennedy was murdered on Nov. 22, 1963. Today is the 44th anniversary of JFK's assassination.
But then there was the phone call to federal agents from a motel manager concerning what she'd seen in a room rented by two Cuban nationals.

"Had seen lying on the bed several automatic rifles with telescopic sights, with an outline of the route that President Kennedy was supposed to take in Chicago that would bring him past that building," said former Secret Service agent Abraham Bolden.
Bolden recalled how agents bungled surveillance of those two suspected Cuban hit men. They disappeared and were never identified.

I think the writer suggests the two Cuban men went to Dallas next.

What do you think is the truth about Kennedy's death?