A law enforcement official told the Associated Press that authorities have arrested at least one person in connection with Matthew Perry's death.

The official was not authorized to discuss details of the ongoing investigation and spoke to the Associated Press on condition of anonymity. Authorities have scheduled a press conference in Los Angeles to announce details of the case later Thursday morning.

Los Angeles police stated in May that they are working with the U.S. Drug Enforcement Administration and the U.S. Postal Inspection Service in an investigation into why there was so much surgical narcotic in the body of the 54-year-old man.

On October 28, an assistant found Perry lying face down in the hot tub, and the paramedics who were called immediately pronounced him dead.

An autopsy report released in December showed that the amount of ketamine in his blood was within the range used for general anesthesia during surgery.

The drug, which dates back decades, has seen a tremendous increase in use in recent years as a treatment for depression, anxiety, and pain. People close to Perry told investigators that he had been undergoing ketamine infusion therapy.

But the coroner stated that Perry's last treatment a week and a half prior did not explain the levels of ketamine in his blood. The drug is typically eliminated from the body within hours. The coroner's report noted that at least two doctors were treating Perry: a psychiatrist and an anesthesiologist who served as his primary care doctor. No illegal drugs or paraphernalia were found in his home.

The report indicated that ketamine was the primary cause of death, which was ruled an accident with no suspicion of foul play. The coroner said drowning and other medical issues were contributing factors.

Perry struggled with years of addiction dating back to his time on "Friends," when he became one of the biggest television stars of his generation playing Chandler Bing alongside Jennifer Aniston, Courteney Cox, Lisa Kudrow, Matt LeBlanc, and David Schwimmer for 10 seasons from 1994 to 2004 on the hit NBC sitcom.