As noted above, two guys named Bob and Louis (or Lewis) both shot at Louis Collins ~ according to John Hurt himself in an interview.

The fact that one of these assailants had the same first name as the victim certainly makes things confusing. For years, until very recently (i.e. unti reading this thread), I always assumed that the "Louis" who "shot too" was the victim Mr. Collins.

I don't think I'll be singing it any differently now that I've learned something new about the story ;^)

There aren't a whole lot of lyrics to this song, are there? Just a very few rhyming couplets, a chorus, and a lot of repetition. It's such an effective song that one doesn't notice any such "shortcomings" at first listening, or even at hundredth. listening.