Notre Dame law professor G. Robert Blakey is a recognized expert on organized crime and an authority on the JFK assassination. He is the author of the 1981 book, The Plot To Kill the President, and in the late 1960s he campaigned for and helped write much of the anti-racketeering legislation that would usher in the demise of the Mafia. As chief counsel to the 1977 House Select Committee on Assassinations, Blakey led the investigation into President John F. Kennedy's assassination, reexamining the evidence with a new forensics panel. The committee found that there was a "probable conspiracy," suggesting that parts of the Mafia and/or certain anti-Castro Cuban groups "may have been involved."

In his interview with FRONTLINE, Blakey calls the prosecution case against Lee Harvey Oswald "open and shut." While he does not see Oswald as a Soviet, CIA or FBI recruit, he is careful to point out many of the unanswered questions regarding Oswald's mysterious associations and possible ties to the mob. This interview was conducted in 1993 in conjunction with Frontline's first broadcast of "Who Was Lee Harvey Oswald?" For this 2003 publication of the interview, Mr. Blakey has added a notation to those questions touching on the CIA, and refers the reader to a long addendum at the end of the interview that reflects his opinion on the CIA in light of current revelations.

Historian Priscilla Johnson McMillan was a reporter in Moscow in the 1950s and interviewed Lee Harvey Oswald shortly after his defection to the Soviet Union. Later, after the Kennedy assassination, McMillan befriended Oswald's widow, Marina, and the two spent considerable time together. In 1977, McMillan wrote Marina and Lee, an intimate portrait of the Oswalds' life together.

Although Marina declined to be interviewed for FRONTLINE's program, McMillan talks about the perplexing, troubling events of Oswald's life based on what Marina confided to her. Marina repeated to McMillan what she told the Warren Commission in 1964--that her husband was not capable of being recruited as a conspirator, and that he most likely acted alone in killing President Kennedy. This interview was conducted in 1993 in conjunction with Frontline's first broadcast of "Who Was Lee Harvey Oswald?"

He is the older brother of Lee Harvey Oswald, and a former Marine and salesman. He is convinced that his brother was solely responsible for the assassination of John F. Kennedy and in this interview offers details about Lee's formative years and young adult life, describing how his brother's love of television shows on intrigue and espionage such as "I Led Three Lives," became the "training ground for his imagination." According to Robert Oswald, the "hard physical evidence" leads him to one conclusion: "The Warren Commission was correct." This interview was conducted in 1993 in conjunction with Frontline's first broadcast of "Who Was Lee Harvey Oswald?"

A former litigator, Posner is a fulltime investigative writer. Among his nine books is the bestseller, Case Closed (1993), which concludes that Lee Harvey Oswald acted alone in the assassination of President John F. Kennedy. In this interview, Posner talks about the forensic evidence over the years that points to Oswald as the lone assassin and the lack of credible evidence to support the various conspiracy theories. Posner also discusses the actions, motivations and mob connections of Jack Ruby, who murdered Oswald. This interview was conducted in 1993 in conjunction with Frontline's first broadcast of "Who Was Lee Harvey Oswald?"