Photo: Sonoma County Sheriff’s Office

Dr. Thomas Keller

A California doctor has been accused of overprescribing painkillers to many of his patients, resulting in the deaths of at least five of them, PEOPLE confirms.

According to a statement from the California Attorney General’s Office, Santa Rosa neurosurgeon and pain management specialist Dr. Thomas Keller, 72, faces four counts of felony murder, a single felony count of elder abuse and four felony counts of issuing prescriptions for opioids without a legitimate medical purpose.

The Aug. 8 complaint alleges that “between October 2011 and July 2017, Keller prescribed a wide range of highly addictive opioids, and consistently and drastically increased his patients’ opioid prescriptions.”

The criminal complaint further alleges that Keller increased patients’ opioid dosage “while prescribing medications such as Soma, a muscle relaxant, and benzodiazepines — both of which are known to cause a dangerous drug interaction when taken with opioids.”

The statement further alleges Keller continued this treatment “despite Red Flag warnings from pharmacies and insurance companies, his own observations of his patients, and knowledge of his patients’ deaths from drug overdose.”

It was unclear Friday if Keller, who was arrested Monday, had entered pleas to the charges against him.

PEOPLE was also unable to reach his lawyer, John Cox, for comment, butCBS 13 received a statement from himthat calls the charges “an injustice.” Cox added: “The Attorney General’s Office is absolutely overreaching in an effort to try and show they are doing something about the opioid crisis.”

Keller remains behind bars without bond.

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California Attorney General Xavier Becerra issued a statement about the allegations.

“Doctors take an oath to protect patients and not engage in behavior that can risk their health and safety,” the statement reads. “When we see evidence of a crime and patient harm, we must act. The opioid epidemic is destroying our communities and taking our loved ones. The California Department of Justice will continue to prosecute fairly and diligently all those who are alleged to have abused our healthcare system and over-prescribe drugs at the expense of their patients.”

The charges are the culmination of an investigation that launched just over a year ago into elder abuse allegations.

source: people.com