LOS ANGELES (CBS) — A Rowland Heights doctor has been charged with second-degree murder after three of her patients died from prescription drug overdoses.

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Hsiu-Ying “Lisa” Tseng, 42, was arrested Thursday by state Medical Board investigators, according to Los Angeles County District Attorney’s Office officials. She is being held on $3 million bail and is scheduled to be arraigned Friday.

Tseng was charged with murder in the drug overdose deaths of Vu Nguyen, 29, of Lake Forest, on March 2, 2009; Steven Ogle, 25, of Palm Desert, on April 9, 2009; and Joseph Rovero III, 21, a University of Arizona student from San Ramon, on Dec. 18, 2009. All three men were patients of Tseng, who prescribed a myriad of drugs for them.

Fatal overdoses from prescription drugs now outnumber traffic accident deaths in the United States, according to Los Angeles County District Attorney Steve Cooley.

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“Dr. Feelgoods who knowingly over-prescribe drugs for no medical reason other than someone asks for the drugs and pays the doctor a staggering amount of money will be dealt with severely,” Cooley said in a statement.

Tseng is also facing a felony count of prescribing drugs using fraud and 20 felony counts of prescribing drugs without a legitimate purpose.

The investigation into Tseng involved undercover work and a search warrant that was executed at Tseng’s clinic, Advanced Care AAA Medical. Tseng’s husband, also a physician, continues to operate the clinic.

Tseng’s license to prescribe drugs was revoked by the DEA and the Osteopathic Medical Board of California has moved to revoke her license.

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Tseng faces a possible maximum state prison term of 45 years to life if convicted as charged.