Events in the French Quarter have broken many hearts for almost 300 years. It has the veneer of a happy place. It is not.
I will say this though. NOPD is a lightening rod for criticism. Much of that criticism is justified, but much is not. The NOPD has some of the wiliest, street savvy and most dedicated detectives in the nation. They will WANT to get this guy, and odds are very good that they will. About the only way this case remains open is if it was a random kook from outside, and he has fled back home. That is -very- unlikely given the area the crime took place and the clothing description of the subject. They are gonna get him.
Only 78% of the murders in New orleans go unsolved, maybe he will be one of the 22%.