The OP was in Texas, and BR posted the relevant statute. In Texas if the shoot is deemed a legitimate self defense shoot, then the citizen is immune from civil damages. He might, or might not, have to actually go to civil court in response to the suit to plead the case and get it dismissed. The usual practice in Texas is to send a SD shoot to a grand jury for disposition. If no-billed, then it is very unlikely that a civil suit would see the court docket. If the DA simply decides to not file charges without submitting to a grand jury, then there is the possibility that some stupid dead guy's relatives might try their luck at the craps table that is the Texas civil courts.