Here's a little insider info from some LEO friends of mine.
The case is "under investigation", but the police have pretty much turned the whole thing over the the States Attorney as per Florida Law. The cops don't expect that any charges will ever be filed against the guy who pulled the trigger, and most of them have no real problem with the way it went down.
As far as the guy being sued, good luck with that. The law in Florida makes it illegal for a person, or his heirs, to profit from something that happened, such as being injured, during the commission of a felony. Not only is the scum bag hosed, his family doesn't have a leg to stand on in a wrongful death suit either.
The only real problem I have with the whole thing is that one of the local news programs showed a copy of the gun owners receipt of purchase and touted it as his "GUN REGISTRATION". There is no "gun registration" in Florida. In fact, it's illegal to maintain a list of gun owners for any purpose in Florida. I wish these people would read Florida Statute 790 before they start running their mouths about things they don't know about, especially if they are going to report their gibberish as fact.