There are some who speculate (with some pretty decent supporting circumstantial evidence) that JD Tippit was set up to be killed in order to frame Oswald, and that the Dallas PD would take care of Oswald to avenge their fellow cop. At the time of Oswald's arrest, the DPD were looking for him over the Tippit shooting and he was only later connected to JFK.
By this theory, Ruby was only cleaning up what others had hoped the DPD would take care of.
I remember reading about J.D. Tippet, and Oswald getting arrested on suspicion of his murder, but I didn’t know about the DPD angle.
I remember Rolling Stone doing a big write-up about the possibility of multiple shooters, they even showed a picture that they claimed was the shooter on the grassy knoll as seen thru some trees.
I wonder if we’ll ever know what really happened. I’m interested in seeing this new film when it comes out.
The Rolling Stone article was from the ‘70s I think.
My Father’s theory was that Oswald was told that Tippet would be his ride out. Tippet was to kill Oswald and be the hero , unfortunately for him, he got outdrawn. Oswald then had no way out and went to the movies.