Dr. Mark Chavez, a San Diego doctor charged in connection with Matthew Perry's death, is expected to plead guilty to conspiring to distribute the anesthetic ketamine in a Los Angeles federal court. Chavez has reached a plea agreement with prosecutors and is the third individual to plead guilty following Perry's fatal overdose last year. He has agreed to cooperate with the U.S. Attorney’s Office against other suspects, including Dr. Salvador Plasencia and Jasveen Sangha, who are accused of illegally supplying ketamine to Perry. The actor was found dead on October 28, with the medical examiner ruling ketamine as the primary cause of death. Chavez potentially faces a sentence of up to 10 years in prison if convicted. Text messages revealed the scheme involved Chavez obtaining ketamine through fraudulent prescriptions for Plasencia, who sold it to Perry for $4,500.