A California doctor at the center of the investigation into Matthew Perry’s overdose has pleaded guilty to illegally supplying the actor with ketamine, despite knowing about his long battle with addiction.

Dr. Salvador Plasencia, 43, entered guilty pleas on four counts of ketamine distribution in a Los Angeles federal courtroom on Wednesday. The plea comes just weeks before he was scheduled to go to trial. He is now the fourth out of five individuals charged in connection with Perry’s October 2023 death to admit guilt.

Federal prosecutors said Plasencia, along with an alleged drug supplier known as the “Ketamine Queen,” faced the most serious charges in the case. While Plasencia was not the person who directly gave Perry the fatal dose, he confessed to illegally providing ketamine to the actor several times in the month leading up to his death.

In court, Plasencia acknowledged that he gave Perry an injection that caused a spike in the actor’s blood pressure and still left behind more of the drug for Perry’s assistant to administer later. He admitted to charging Perry thousands of dollars for the treatments and bringing in another doctor, Mark Chavez, to assist in acquiring the ketamine. In one text message referenced in court, Plasencia called Perry a “moron” and suggested he could be taken advantage of for money.

Following the hearing, Plasencia’s attorney said the doctor was deeply remorseful and intends to voluntarily give up his medical license. “He acknowledges his failure to protect Mr. Perry, a patient who was especially vulnerable due to addiction,” the statement read.

As part of the plea deal, federal prosecutors agreed to drop additional charges, including three extra distribution counts and two charges related to falsifying records. Although each count could result in up to ten years in prison, Plasencia is expected to receive a lighter sentence during a hearing scheduled for December. He remains free on bond until then.

Matthew Perry, best known for his role as Chandler Bing on Friends, was found unresponsive in his hot tub on October 28, 2023. He had openly spoken about his addiction struggles in the past. Though he had been prescribed ketamine as an off-label treatment for depression, he began seeking more than what his regular doctor was willing to provide.