Gunman bought rifle on the same day he killed 4 people, Tulsa police chief says

Two orthopedic surgeons, a medical office staffer and a patient visitor were killed in a mass shooting Wednesday on the campus of Saint Francis Health System in Tulsa.

The gunman reportedly was able to purchase a semi-automatic rifle just hours before the slayings targeting a specific physician, according to investigators.

Mayor G.T. Bynum and officials from Saint Francis Health System and Tulsa Police Department offered more details Thursday on the shooting that left four innocent people dead, as well as the gunman.

The victims were identified by Tulsa Police Chief Wendell Franklin as Dr. Preston Phillips, Dr. Stephanie Husen, Amanda Glenn and William Love. A family member of Glenn's said the chief misspoke when identifying her last name during the news conference.