"'I wonder how much this moron will pay,' Dr. Plasencia texted Dr. Chavez, who prosecutors said later supplied [Matthew Perry] with a total of 22 vials of ketamine and ketamine lozenges..."

"... obtained through a fraudulent prescription for the drug. 'Lets find out.' Dr. Chavez agreed to plead guilty to one count of conspiracy to distribute ketamine. Dr. Plasencia, known as 'Dr. P.,' soon instructed [Perry's assistant, Kenneth] Iwamasa on how and where to inject ketamine into Mr. Perry’s body. 'Found the sweet spot but trying different places led to running out,' Mr. Iwamasa texted Dr. Plasencia on Oct. 4, according to court documents. Over the next several days, Mr. Iwamasa’s requests for ketamine became more urgent. 'I just ran out,' Mr. Iwamasa texted the doctor, who replied he had two vials to sell him if the assistant could meet him in downtown Santa Monica."

From "'Shoot Me Up With a Big One': The Pain of Matthew Perry’s Last Days/Court papers show that Mr. Perry, the 'Friends' star who had long struggled with addiction, was increasingly taking ketamine, a powerful anesthetic, in the days before he died" (NYT)("Mr. Iwamasa was one of five people who the authorities in California said this week had been charged with a conspiracy to distribute ketamine, a powerful anesthetic, to Mr. Perry. The defendants also included two doctors, a woman accused of being a dealer and an acquaintance who pleaded guilty to acting as a middleman").