Climbing into his backyard jacuzzi that overlooked the Santa Monica Mountains, Matthew Perry uttered the seven words that would ultimately lead to his death: “Shoot me up with a big one.”

The big one, court documents would later reveal, was a dose of ketamine, a prescription anaesthetic and a hallucinogen that has become popular for its off-label uses to treat depression and anxiety. It was the actor’s third injection of the day.

Hours after that fatal dose, the “Friends” actor was found face down in the jacuzzi. Medics pronounced him dead at the scene with a coroner finding ketamine was his primary cause of death.

The details about Perry’s last day alive on 28 October 2023 were revealed in court documents following a police probe that ultimately led to five people being charged in relation to his death.

The documents offer an in-depth look by the law enforcement agencies into his drug addiction, which he struggled with for decades, and a glimpse into Hollywood’s ketamine drug network. Doctors and experts told the BBC the growth in ketamine’s popularity in recent years has caused the market to explode, with the expansion of ketamine clinics and online services offering easy prescription access to the drug, as well as a burgeoning illicit drug market.

“It’s super easy [to get], - be it underground or prescription,” Dr David Mahjoubi, who serves as president of the American Board of Ketamine Physicians, told the BBC. “I have celebrities that are getting a prescription from me. It’s super easy, not hard at all.”