Luigi Nicholas Mangione was apparently living a charmed one: the grandson of a wealthy real estate developer, valedictorian of his elite Baltimore prep school and with degrees from one of the nation’s top private universities. Friends at an exclusive co-living space at the edge of touristy Waikiki in Hawaii where the 26-year-od Mangione once lived widely considered him a “great guy.” Pictures on his social media accounts show a fit, smiling, handsome young man on beaches and at parties. Now, investigators are working to piece together why Mangione diverged from a path of seeming success to make the violent and radical decision to gun down UnitedHealthcare CEO Brian Thompson in a brazen attack on a Manhattan street.