The House Select Committee on Assassinations was established to investigate the assassinations of JFK and MLK.
After their investigation, they concluded that the official narrative was most likely wrong and they found a high probability that two gunmen fired at President John F. Kennedy.
There were no investigations after that..
> Scientific acoustical evidence establishes a high probability that two gunmen fired at President John F. Kennedy. Other scientific evidence does not preclude the possibility of two gunmen firing at the President. Scientific evidence negates some specific conspiracy allegations.
> The committee believes, on the basis of the evidence available to it, that President John F. Kennedy was probably assassinated as a result of a conspiracy. The committee is unable to identify the other gunman or the extent of the conspiracy.
For me the real kicker from the HSCA is George Joannides:
> At the HSCA, Joannides had been specifically assigned to handle queries about the DRE and its relations with the CIA. The Agency had assured the committee that he had no connection whatsoever to the matters under investigation; that, in fact, he was merely an Agency lawyer and had not been “operational” in 1963. These assurances were self-evidently false. At one point, Joannides informed the committee that the identity of the DRE’s case officer at the time of the Kennedy assassination — Joannides himself — could not be determined.
The HSCA conclusions were largely based on the now discredited acoustic analysis of the police channel dicabelt recording. If it weren't for that the findings would have largely supported that of the Warren Commission.
The House Select committee didn't do a very good job and did not have access to accurate information. There has been, of course, plenty of investigating done on the assassination since then. A well-known overview is Gerald Posner's Case Closed, it goes over the deficiencies of that and many other assassination theories with a fine-toothed comb.
After their investigation, they concluded that the official narrative was most likely wrong and they found a high probability that two gunmen fired at President John F. Kennedy.
There were no investigations after that..
> Scientific acoustical evidence establishes a high probability that two gunmen fired at President John F. Kennedy. Other scientific evidence does not preclude the possibility of two gunmen firing at the President. Scientific evidence negates some specific conspiracy allegations.
> The committee believes, on the basis of the evidence available to it, that President John F. Kennedy was probably assassinated as a result of a conspiracy. The committee is unable to identify the other gunman or the extent of the conspiracy.
https://www.archives.gov/research/jfk/select-committee-repor...