Celebrity Death Twist: Assistant Imprisoned

Matthew Perry’s former assistant has been sent to prison, turning a celebrity overdose case into a harsh reminder of how deadly illegal drug access can become when trust is abused.

Quick Take

Kenneth Iwamasa was sentenced to 41 months in federal prison and fined $10,000 after pleading guilty to conspiracy to distribute ketamine resulting in death.^[2]
Prosecutors said he repeatedly injected Matthew Perry with ketamine, including the fatal dose that came before Perry was found dead in his jacuzzi.^[2]^[3]
The sentencing closed the final defendant’s case in a federal investigation that tied multiple people to the illegal ketamine supply chain.^[1]^[2]
The official medical ruling listed ketamine as the primary cause of death, with drowning as a secondary cause.^[1]

Federal Sentence Ends Final Chapter

U.S. District Judge Sherilyn Peace Garnett sentenced Kenneth Iwamasa on Wednesday in Los Angeles after he pleaded guilty in August 2024 to conspiracy to distribute ketamine resulting in death.^[1]^[2] ABC News reported that the court imposed 41 months in prison, two years of probation, and a $10,000 fine.^[1]^[2] The sentence makes Iwamasa the final defendant to be punished in the federal case tied to Perry’s 2023 death.^[1]

Reporting from ABC News said prosecutors treated Iwamasa as a central figure in the supply chain, not a passive bystander.^[2] They said he injected Perry repeatedly in the weeks before the actor died, lacked medical training, and delivered the fatal dose on October 28, 2023.^[2] NBC News likewise reported that prosecutors alleged he gave Perry the final fatal dose, while the plea deal made him the government’s most important witness.^[4]

Prosecutors’ Account of the Ketamine Chain

According to ABC News, Iwamasa’s plea agreement said he bought ketamine from another doctor and learned how to inject it from that source.^[1] Prosecutors also said he later worked with two doctors and then two dealers to obtain dozens of vials of ketamine for Perry.^[2] That account matters because it frames the case as organized illegal distribution, not a one-time mistake or accidental delivery.^[2]

The allegations described a disturbing pattern in Perry’s final days.^[1]^[2] ABC News reported that prosecutors said Iwamasa injected Perry six to eight times per day near the end, found him unconscious at least twice in October 2023, and still continued giving him ketamine.^[1]^[2] NBC News reported that Perry allegedly asked for a “big one” on the day he died, then was found dead in the jacuzzi after Iwamasa left to run errands.^[4]

Medical Findings and Public Frustration

The Los Angeles County Medical Examiner ruled that ketamine was the primary cause of death, with drowning as a secondary cause.^[1] That detail gives the prosecution a strong factual basis, but it also shows the death was medically documented as more than a single event.^[1] For readers who are tired of elite breakdowns, the case underscores how illegal drug culture, weak boundaries, and personal access can combine with deadly results.^[1]^[2]

The final sentencing in connection with the ketamine overdose death of "Friends" star Matthew Perry took place Wednesday when the actor's former live-in personal assistant was sentenced in Los Angeles to prison as part of a plea agreement. https://t.co/T7u9KMFe99

— NBC 7 San Diego (@nbcsandiego) May 28, 2026

The public reaction has been shaped by the emotional weight of a beloved television star’s death and by repeated media descriptions of Iwamasa as the assistant who injected Perry with the fatal dose.^[2]^[3]^[4] NBC News reported that Iwamasa cooperated with prosecutors and received a reduced sentence compared with the gravity of the offense.^[4] ABC News said he was the final defendant sentenced, which closes a case that has already fueled anger over drug abuse, enabling behavior, and the wreckage left behind.^[1]