On June 30, 2016, at approximately 1:00 p.m., Dallas Police responded to 4600 Samuell Boulevard regarding an assault at a treatment facility. As a result of the investigation and through surveillance video, Tony Cason, a White male, 55-years-old, is observed attacking a physician causing her to strike her head on the ground. The physician, Ruth Mardock, was transported to an area hospital for treatment. Cason was arrested at the scene and charged with aggravated assault. On July 2, 2016, Dr. Mardock died as a result of her injuries. The aggravated assault charge has been released. Cason is currently in jail charged with manslaughter, his bail has been set at $100,000.00. Below is the link to the probable cause affidavit.