The man paid to protect Matthew Perry’s sobriety instead became the one repeatedly sliding the needle in.
Story Snapshot
- Matthew Perry’s live-in assistant, Kenneth Iwamasa, has been sentenced to 41 months in federal prison for his role in the actor’s ketamine death.[2]
- The Department of Justice says he obtained ketamine from illegal sources and repeatedly injected Perry, including the fatal dose.[1][2]
- The case exposes a shadow world where “helpers” and doctors quietly feed addictions behind mansion gates.[1][2]
- The sentence raises hard questions about personal responsibility, accountability, and how far the justice system should go when an addict dies.[1][2]
The final assistant in the spotlight of a Hollywood overdose
Federal prosecutors did not describe Kenneth Iwamasa as a bystander in Matthew Perry’s unraveling; they called him the central player who turned a struggling actor’s home into a ketamine clinic without a sign on the door.[1][2]
The United States Attorney’s Office says that between September and late October 2023, Iwamasa conspired with a physician and a drug counselor to supply Perry with ketamine outside legitimate medical channels.[2]
For that conspiracy, resulting in death, a federal judge handed him 41 months in prison.[2]
Television reports and the Justice Department press release paint the same core picture: a high-earning, trusted assistant making $150,000 a year, embedded in Perry’s daily life, and slowly becoming the point man for every vial, every syringe, every dose.[1][2]
A judge described his role as central to Perry’s “descent into ketamine addiction.”[1] This was not a one-off favor or a panicked bad decision; it was a routine that unfolded over weeks as the injections mounted and Perry’s risk escalated.[1][2][4]
How the ketamine pipeline into Matthew Perry’s home worked
According to the Department of Justice, Iwamasa helped build a distribution chain that looked nothing like proper medical care.[2] Prosecutors say he worked with a Santa Monica physician, Salvador Plasencia, who allegedly taught him how to inject ketamine while supplying off-the-books product.[1][2]
When that source was not enough, Iwamasa allegedly turned to drug counselor Erik Fleming, who obtained ketamine from a street dealer and funneled it into the home of a wealthy, vulnerable patient.[1][2]
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
Federal documents state that by the weeks leading up to Perry’s death, this pipeline was running at full tilt.[2] Prosecutors and news outlets report that Iwamasa was injecting Perry six to eight times per day in his final days, a pace that erases any pretense of cautious treatment.[1][4]
On October 28, 2023, the government says Iwamasa injected Perry with at least three shots of ketamine supplied through this illicit network; that dosing, according to prosecutors, caused his death.[2] The county medical examiner later listed ketamine as the primary cause, with drowning secondary.[1][2]
From “Friends” star to federal case file
The sentencing closes a multi-defendant federal case that pulled in not just the assistant but also medical and quasi-medical figures who orbited Perry’s addiction.[2]
Iwamasa was the fifth and final defendant to be sentenced, following the doctor and other providers who admitted roles in getting ketamine into his system.[2]
While one former physician received home detention and probation for conspiracy to distribute ketamine, Iwamasa received years in prison because he was the one physically injecting the actor, day after day, until the end.[2]
News coverage emphasizes that he was not only the last person to see Perry alive but also the one who discovered his body in the backyard jacuzzi.[1] He later became the government’s most important witness, pleading guilty in August 2024 and cooperating.[1]
That cooperation likely helped reduce his exposure, yet the judge still imposed more than three years in prison, plus supervised release and a fine, reflecting the court’s view that his conduct crossed far beyond loyalty into lethal enabling.[1][2][3]
What this case reveals about enabling, choice, and accountability
Matthew Perry was an adult, long open about his addictions, and chose to seek relief in powerful drugs.
But this case raises a follow-up question: what happens when the people paid to protect a vulnerable person’s boundaries are the very ones who drive past every guardrail?
The court effectively answered that by treating the assistant not as a passive errand runner but as a conspirator whose actions carried foreseeable, fatal risk.[1][2][4]
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 often wants a simple “who killed whom” headline in celebrity overdose cases. The law moves differently. Here, prosecutors did not have to prove that Iwamasa alone was morally worst; they had to prove that he joined a conspiracy to distribute ketamine that ended in death, and that he repeatedly injected the drug, including on the day Perry died.[2][4]
That is why the official record says he will spend over three years in prison, and why his sentencing feels less like a Hollywood tragedy and more like a stark warning to every “helper” who quietly becomes a dealer in a nice suit.[1][2]
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 …
[3] Web – Matthew Perry’s Former Live-In Personal Assistant Sentenced to …
[4] YouTube – Matthew Perry’s former assistant jailed over ketamine conspiracy
