The man hired to protect Matthew Perry’s sobriety ended up being the one injecting him with the ketamine that killed him.
Story Snapshot
- Matthew Perry’s longtime live-in assistant, Kenneth Iwamasa, admitted he repeatedly injected the actor with ketamine, including the fatal dose.
- A federal judge sentenced him to 41 months in prison for conspiracy to distribute ketamine resulting in death and serious bodily injury.
- The case exposes a shadowy pipeline of “off-the-books” ketamine flowing through doctors, counselors, and friends.
- The story forces hard questions about addiction, personal responsibility, and how far the law should go in overdose deaths.
The trusted gatekeeper who became the source of danger
Federal prosecutors say that from September 2023 until Matthew Perry’s death in late October, live-in assistant Kenneth Iwamasa was not just managing schedules and errands; he was managing an illegal ketamine supply chain built around his boss’s addiction.[2]
According to the United States Department of Justice, he obtained ketamine from a physician and a drug counselor and then personally injected Perry over and over.[2] This was not a one-time lapse but a daily pattern that blurred the line between caregiver and dealer.
Matthew Perry’s Assistant Gets More than 3 Years in Prison for Injecting Actor with Ketamine on Day He Died https://t.co/Wy2fnJ5CX4
— People (@people) May 27, 2026
Coverage of the sentencing describes Iwamasa as Perry’s “enabler, drug messenger and de facto doctor,” a man who had become indispensable in the star’s final months.[1]
Prosecutors and reporters alike stress that he was at Perry’s side through his descent back into heavy ketamine use, injecting him six to eight times a day in the final stretch.[1][2]
Those numbers matter because they show how routine the injections had become and how normalized hard drug use can look when it is wrapped in the language of “treatment” and “care.”
How the ketamine pipeline worked and why the law cared
The Department of Justice outlines a simple but damning chain.[2] A physician, Salvador Plasencia, allegedly provided off-the-books ketamine and showed Iwamasa how to inject it.[1][2]
A drug counselor, Erik Fleming, sourced additional ketamine from a street dealer.[2] Prosecutors say Iwamasa then took those supplies, coordinated with the others, and used the drug on Perry repeatedly, including on the day he died.[2]
Federal law does not just target the street dealer; it targets everyone in the conspiracy who knowingly feeds a dangerous addiction.
On October 28, 2023, the chain ended in Perry’s backyard.[2] Prosecutors say Iwamasa injected Perry with at least three shots of ketamine from that illicit pipeline, left to run errands, and returned to find him dead in his jacuzzi.[1][2]
The Los Angeles County Medical Examiner found ketamine as the primary cause of death, with drowning as secondary.[1]
That medical conclusion transformed a private spiral into a federal crime scene. Once ketamine becomes the lethal agent, everyone involved in supplying and administering it is on legal notice.
The plea deal, the sentence, and what they signal
Iwamasa pleaded guilty in August 2024 to conspiracy to distribute ketamine resulting in death and serious bodily injury.[2] That charge is not a casual paperwork violation; it carries the weight of a homicide-adjacent finding without saying “murder.”
Prosecutors highlight that he was the fifth and final defendant sentenced in the case, underscoring that the government saw a network, not just a lone bad actor.[2] He received 41 months in federal prison, two years of probation or supervised release, and a $10,000 fine.[1][2][4]
Some viewers will look at a three‑and‑a‑half‑year sentence and ask whether it is too light for a man who injected the fatal dose; others will argue it proves the system still recognizes Perry’s own agency in his relapse.
From this perspective, the outcome reflects a compromise: the court punished the assistant for crossing the bright line between helper and trafficker, while stopping short of treating him like a cold-blooded killer. He became a co-author of the risk, not the sole author of the tragedy.
Enabler, victim, or both? The moral knot at the center
Defense voices and sympathizers tend to emphasize that Iwamasa lived in the gravitational pull of a wealthy, addicted celebrity who could pay handsomely and demand loyalty.[1]
That picture resonates with many Americans who have watched addiction tear through families: loved ones rationalize, enable, and sometimes supply, convincing themselves they are “helping.”
Yet the facts set out by the Department of Justice undercut any claim that Iwamasa was merely passive.[2] He sought out illegal sources, learned to inject, and kept going as the doses escalated.[1][2]
American values put heavy weight on personal responsibility, and that cuts both ways here. Perry fought addiction for years and knew the risks of powerful drugs.
But a sober assistant who buys off-the-books ketamine, injects a client multiple times per day, and administers the fatal dose cannot hide behind the victim’s choices.[1][2][4]
The lesson is not that the law should criminalize grief-stricken friends; it is that once you join the supply chain of a dangerous drug, you step into liability alongside the dealers and pill‑mill doctors.
Sources:
[1] Web – Matthew Perry’s assistant gets more than 3 years in prison for central …
[2] Web – Matthew Perry’s assistant gets 3 years, 5 months in prison for central …
[4] YouTube – Matthew Perry’s former assistant jailed over ketamine conspiracy
