Chuck Connors comes to mind but not clear if he was good with a revolver
IMO JD Tippit was a pawn ...... He was set up to be killed. ( someone on the phone in the Record Shop sent him to 10th and Patton) The plotters thought that it would appear as though Tippit had been killed by the patsy who had eluded being killed in the TSBD. The plotters thought that Lee Oswald was still renting a room at Mrs Bledsoe's house on Marsalais.
The plotters thought that Lee Oswald would be shot by the first cop he encountered....... in the theater.