The gunman accused of killing his surgeon and three other people at a Tulsa hospital complex before taking his own life was a former resident of New Jersey, where he graduated high school and college before relocating to Oklahoma, according to his family. Michael Louis’ older brother, who spoke to NJ Advance Media Thursday afternoon outside the Newark house where they both had lived until Louis left New Jersey in 2013, said his sibling seemed to change after a painful back condition and an unsuccessful operation. “To kill his doctor, and another doctor, and two other people?” said Louis’ broth…