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After the assassination of President John F. Kennedy Marina was taken by the Federal Bureau of Investigation and kept at the Inn of the Six Flags Hotel. Threatened with deportation, she agreed to give the authorities all the information she had. Some of this was information was later used by the Warren Commission to suggest that her husband was the lone assassin.
In 1965 Marina married Dallas carpenter, Kenneth Porter and went to live in Richardson, Texas with her two daughters and her new husband. Later she gave birth to a son.
At first Marina accepted the truth of the Warren Commission but over the years she has began to question the role her husband played in the killing of John F. Kennedy. She was especially influenced by the House Select Committee on Assassinations report published in 1979.
In an interview she gave to the Ladies Home Journal in September 1988 she argued: ''I'm not saying that Lee is innocent, that he didn't know about the conspiracy or was not a part of it, but I am saying he's not necessarily guilty of murder. At first, I thought that Jack Ruby (who killed Oswald two days after the assassination) was swayed by passion; all of America was grieving. But later, we found that he had connections with the underworld. Now, I think Lee was killed to keep his mouth shut.''
Marina added: '' I believe he worked for the American government... He was taught the Russian language when he was in the military. Do you think that is usual, that an ordinary soldier is taught Russian? Also, he got in and out of Russia quite easily, and he got me out quite easily.''
Marina later remarried and became known as Marina Oswald Porter. In the 1990s she became involved in a campaign to clear the name if her former husband. In April 1996 she wrote that : "At the time of the assassination of this great president whom I loved, I was misled by the "evidence" presented to me by government authorities and I assisted in the conviction of Lee Harvey Oswald as the assassin. From the new information now available, I am now convinced that he was an FBI informant and believe that he did not kill President Kennedy."