Dr. Preston Phillips -- a former WNBA team doctor -- was the main target in the deadly mass shooting at a hospital in Oklahoma this week that left four innocent people dead.
A male gunman opened fire on the second floor of the Warren Clinic in Tulsa Wednesday afternoon ... after police say a patient of the hospital traveled to the clinic with multiple weapons and opened fire.
Cops say the killer -- who we've chosen not to identify -- was furious with Dr.