20 Things You Didn't Know About JFK
6. Jim Garrison's Later Career
The film ends with Garrison's obvious defeat (in reality, the jury deliberated for less than an hour) but with a call to the press that he was going to run again for District Attorney and win and continue to seek the real conspirators, "Let justice be done though the heavens fall" so he quotes the maxim.
A post-script reads that Garrison lost his re-election bid, but it doesn't go any further. There's good reason, as his post-JFK career is full of scandal and conspiracy theorizing. Seems Garrison was one of the first politicians to be accused of bribery over the rough and tumble world of pinballing. It was 1973, and pinball was popular, to own and operate them illegally, owners would often toss local politicians envelopes of cash.
Garrison was acquitted of all charges, but his political career was over. He was unseated...by Harrick Connick Jr.'s father.