Tulsa police said on Thursday that a gunman, who killed four people at a medical building in the Oklahoma city, went to the facility to kill a doctor he blamed for the pain he experienced after surgery.
The gunman, identified as Michael Lewis, entered a building on the St. Francis Health System campus with an AR-15-style weapon and opened fire, killing two doctors and two other people, Tulsa Police Chief Wendell Franklin said at a news briefing.
Lewis, who killed himself, left a letter at the scene, Franklin said.
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In addition to the four fatalities, several others were injured.
The shooting comes on the heels of two mass shootings that have stunned Americans and reopened a long-standing debate over tightening controls on firearms ownership and the role of mental health in the epidemic of gun violence plaguing the country.
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