I am reading this post for the first time and I am extremely sick. I can't believe the cops didn't do a friggin' thing! You need to contact a lawyer and take care of them! I swear people these days! This really makes me sick! It really does. I think you need to get a lawyer and go to court!
Do you know what made him shoot Charlie? Does Charlie get out a lot? Maybe the neighbor was fed up with Charlie running around all the time therefore he shot him. If so that neighbor needs to be locked up for good! If he gets fed up with dogs running around, he might get fed up with people around and start shooting them. Just my thought, I doubt it would happen, but who knows.
I do whatever people do to my dogs. If someone is nice to my dog, then I'm fine with them, but if they hit my dog, then I hit them. In your case, he shot Charlie therefore I would shoot him. I'm dead serious! I love my dogs to much and I would stand up for them no matter what!
Keep us posted on how your sister is!
Chase