Washington [US], August 31 (ANI): One of the two California doctors involved in the investigation into the overdose death of actor Matthew Perry is expected to plead guilty to charges related to the surgical anaesthetic ketamine, as per the Hollywood Reporter. The information was confirmed by a Department of Justice official on Friday, according to The Hollywood Reporter. Mark Chavez, 54, appeared in a Los Angeles federal court on Friday for a bond hearing and arraignment. According to Ciaran McEvoy from the United States Attorneys’ Office, Chavez is expected to enter a guilty plea in the comi…