Hurricane Katrina destroyed most of New Orleans and left the greater Gulf Coast area wrecked. Nearly 2,000 people were killed as a result of the storm and thousands more were permanently displaced from their homes. With an estimated $108 billion dollars of damage, Katrina was also the also costliest disaster in U.S. history. All told, the entire population of New Orleans had their lives forever altered. One consequence of this was a mental-health epidemic. Experts say mental illness flooded into New Orleans as Katrina’s waters receded.