When 55-year-old Sheila Bartels left her doctor's office in Oklahoma, she had a prescription for 510 painkillers. She died the same day of an overdose. Her doctor, Regan Nichols, is now facing five second-degree murder charges -- one for each patient who overdosed after she prescribed them opioid drugs, such as Oxycontin -- prescriptions that can lead to addiction. "Doctors bear enormous responsibility for the opioid crisis," said David Clark, a ...