Officials arrested a doctor on suspicion of three counts of murder Thursday in connection with the deaths of three patients who overdosed on drugs she prescribed at her Rowland Heights office, authorities said.

Hsiu-Ying “Lisa” Tseng, 42, of Walnut, was arrested by California Medical Board investigators and accused of three counts of second-degree murder in the deaths of three men in their 20s, according to the Los Angeles County District Attorney’s Office.

“All were patients of Tseng, who prescribed a myriad of drugs for the three young men,” District Attorney’s Office spokeswoman Sandi Gibbons said.

Patients of Tseng’s received prescriptions for “cocktails of drugs,” which included, in part, Methadone, Oxycodone, Hydrocodone, Oxymorphone and Suboxone, Gibbons said.

Tseng is being held in lieu of $3 million bail pending a scheduled arraignment today in Los Angeles Superior Court, officials said.

If convicted as charged, Tseng could face 45 years to life in state prison.

Read more in ARREST.