Synopsis
Donahue first became interested in the story of the JFK assassination after being invited to participate in a recreation of the shooting as one of eleven invited marksmen and sharpshooters. He demonstrated that it would have been possible for Lee Harvey Oswald to have fired three shots in the time specified by the Warren Commission. However the experience highlighted to Donahue other questions regarding the Warren report, and in particular the fact that the testimony of ballistics experts seemed to have been completely omitted from the Commission's evidence gathering.
Donahue eventually decided that the bullet that struck Kennedy in the head had in fact been fired by agent George Hickey from an AR-15 carried in a secret service car following the President's vehicle. However he also decided that a previous shot had already mortally wounded Kennedy before the head shot was fired.
Read more about this topic: Mortal Error: The Shot That Killed JFK