An LA doctor was charged yesterday with the murders of three healthy young men who fatally overdosed on prescription drugs. Dr. Hsui-Ying "Lisa" Tseng, dubbed “Dr Feelgood” by prosecutors, allegedly wrote up thousands of prescriptions of methadone, Xanax, oxycodone and other drugs to patients who didn't need them. She was arrested after a long investigation by drug enforcement agents—who worked undercover as patients to obtain prescriptions from Tseng. The Osteopathic Medical Board of California has affidavits showing many young men coming to Tseng’s storefront office claiming to have back, neck and wrist pain. Investigators say she did a minor exam, then gave them drugs. Back in 2010, the DEA suspended Tseng's license to write prescriptions after she wrote more than 27,000 'scrips over a three-year period from January 2007. "I was really strict with my patients, and I followed the guidelines," she claimed in a 2010 interview with the Los Angeles Times. "If my patient decides to take a month's supply in a day, then there's nothing I can do about that." The doctor is charged with the 2009 deaths of Vu Nguyen, 29, Steven Ogle, 25, and Arizona State University student Joseph Rovero III, 21. In addition to the murder charges, Tseng faces another 21 felony counts for prescribing meds either fraudulently or without significant merit. The doctor could face 45 years to life in state prison if convicted.