It was. Ever heard of the Warren Commission? The Warren Commission spent thousands of investigative hours pursuing it extensively and dedicated over a hundred pages of its 888 page report to the investigation into Lee Harvey Oswald's claim of being a patsy and Jack Ruby's assassination of him.
Death of Lee Harvey Oswald
In response to Jack Ruby's shooting of Lee Harvey Oswald, the Warren Commission declared that the news media must share responsibility with the Dallas police department for "the breakdown of law enforcement" that led to Oswald's death. In addition to the police department's "inadequacy of coordination," the Warren Commission noted that "these additional deficiencies [in security] were related directly to the decision to admit newsmen to the basement."
The commission concluded that the pressure of press, radio, and television for information about Oswald's prison transfer resulted in lax security standards for admission to the basement, allowing Ruby to enter and subsequently shoot Oswald, noting that "the acceptance of inadequate press credentials posed a clear avenue for a one-man assault." Oswald's death was said to have been a direct result of "the failure of the police to remove Oswald secretly or control the crowd in the basement."
The consequence of Oswald's death, according to the Commission, was that "it was no longer possible to arrive at the complete story of the assassination of John F. Kennedy through normal judicial procedures during the trial of the alleged assassin." While the Commission noted that the prime responsibility was that of the police department, it also recommended the adoption of a new "code of conduct" for news professionals regarding the collecting and presenting of information to the public that would ensure "there [would] be no interference with pending criminal investigations, court proceedings, or the right of individuals to a fair trial."