DALLAS (AP) — A Dallas anesthesiologist was convicted Friday for injecting a nerve-blocking agent and other drugs into bags of intravenous fluid at a surgical center where he worked, which led to the death of a coworker and caused cardiac emergencies for several patients, federal prosecutors said.

A jury convicted Raynaldo Rivera Ortiz Jr., 60, of four counts of tampering with consumer products resulting in serious bodily injury, one count of tampering with a consumer product and five counts of intentional adulteration of a drug, prosecutors said. A sentencing date has not yet been set for Ortiz, who faces up to 190 years in prison.

“Dr. Ortiz cloaked himself in the white coat of a healer, but instead of curing pain, he inflicted it,” U.S. Attorney Leigha Simonton for the northern district of Texas said in a video statement.

Prosecutors said that evidence presented at trial showed that numerous patients at Surgicare North Dallas suffered cardiac emergencies during routine medical procedures performed by various doctors between May 2022 and August 2022. During that time, an anesthesiologist who had worked at the facility earlier that day died while treating herself for dehydration using an IV bag.

Prosecutors said Ortiz, who was arrested in September 2022, had surreptitiously placed the tainted IV bags into a warming bin at the facility and waited for them to be used in his colleagues’ surgeries.

Evidence presented at trial showed that at the time of the emergencies, Ortiz was facing disciplinary action for an alleged medical mistake made in one of his own surgeries, prosecutors said.

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This story has been corrected; the defendant’s first surname is Rivera, not Riviera, according to federal documents.