The Kennedy family refused to cooperate, but Vanity Fair did obtain some hair clippings believed to have been swept from the floor of Peter Lawson's home after JFK received a haircut there and used those to see if there was a DNA match with Worthington.
There was not.
"The person who provided the hair, in this case, possibly JFK, was not the father of Jack Worthington," Friend told ABC News. "That's what the test suggested." (David Friend/Vanity Fair)