TULSA, OKLAHOMA - JUNE 01: Police respond to the scene of a mass shooting at St. Francis Hospital on June 1, 2022 in Tulsa, Oklahoma. At least four people were killed in a shooting rampage at the Natalie Medical Building on the hospital's campus, according to published reports. The shooter is also dead from a self-inflicted gunshot wound, according to police. (Photo by J Pat Carter/Getty Images)

Tulsa (AP) – Police say a man who blamed his surgeon for ongoing pain after a recent back surgery bought an AR-style rifle hours before opening fire at a Tulsa medical office, killing the surgeon and three other people before fatally shooting himself. Tulsa Police Chief Wendell Franklin says the gunman had recently undergone back surgery and had called a clinic repeatedly complaining of pain. Franklin says the doctor who performed the surgery, Dr. Preston Phillips, was killed Wednesday, along with another doctor, a receptionist and a patient.