The main doctor charged in connection with the drug overdose of “Friends” star Matthew Perry is expected to enter a guilty plea in the coming weeks, the US Justice Department said Monday. He went to Perry’s home to administer ketamine by injection, according to a plea deal published Monday by the Justice Department.The main doctor charged in connection with the drug overdose of “Friends” star Matthew Perry is expected to enter a guilty plea in the coming weeks, the US Justice Department said Monday. He went to Perry’s home to administer ketamine by injection, according to a plea deal published Monday by the Justice Department.