@abc7chicago: One of two doctors accused in connection with Matthew Perry's death is set to appear Friday in a federal court in Los Angeles, where he is expected to be arraigned for allegedly conspiring to distribute the surgical anesthetic ketamine. Dr. Mark Chavez, 54, of San Diego, reached a plea agreement with prosecutors earlier this month and would be the third person to plead guilty in the aftermath of the "Friends" star's fatal overdose last year. #matthewperry