Last updated: April 12, 2026
Kenneth Iwamasa — Matthew Perry’s 60-year-old live-in personal assistant — is facing prison after pleading guilty to directly administering the ketamine that killed the beloved Friends actor on October 28, 2023. Searches for Iwamasa have surged this week following the high-profile sentencing of drug dealer Jasveen Sangha (the “Ketamine Queen”) to 15 years in federal prison. Iwamasa is now scheduled to be sentenced on April 22, 2026, where he faces a statutory maximum of 15 years in federal prison. Here is everything you need to know about who Kenneth Iwamasa is, what role he played, and what sentence he is likely to receive.
Who Is Kenneth Iwamasa?
Kenneth Iwamasa, 60, of Toluca Lake, California, served as Matthew Perry’s live-in personal assistant for many years before the actor’s death. Unlike the other defendants in the case — who were drug dealers, doctors, or middlemen — Iwamasa was a trusted member of Perry’s household, someone deeply embedded in the star’s daily life. His role made him uniquely positioned to facilitate Perry’s access to illegal ketamine.
Court documents paint a troubling picture: Iwamasa was not just a passive participant but was actively involved in procuring ketamine on Perry’s behalf and injecting the actor with the drug on multiple occasions. Prosecutors allege that Iwamasa purchased ketamine from a middleman named Erik Fleming, who obtained it from Jasveen Sangha — the North Hollywood drug dealer known as the “Ketamine Queen.” Sangha was sentenced to 15 years in federal prison on April 8, 2026.
Matthew Perry’s Death: What Happened on October 28, 2023
Matthew Perry was found unresponsive in the hot tub at his Pacific Palisades, Los Angeles home on October 28, 2023. He was 54 years old. The Los Angeles County Medical Examiner determined the cause of death was acute effects of ketamine, with drowning, coronary artery disease, and buprenorphine effects listed as contributing factors.
At the time, Perry was a patient receiving legal ketamine infusion therapy for depression and anxiety — a growing and legitimate medical treatment in the US. However, the level of ketamine in his system vastly exceeded any therapeutic dose. Investigators established that Perry had been obtaining additional, illegal ketamine through a network that included Iwamasa, Fleming, and Sangha.
Prosecutors allege that on October 28, 2023 — the day Perry died — Kenneth Iwamasa injected the actor with at least three separate shots of ketamine. Those injections, from vials purchased from Sangha through Fleming, caused the fatal overdose. Perry was found dead in his hot tub hours later.
Iwamasa’s Role in the Ketamine Supply Chain
The Matthew Perry case involved a criminal supply chain with five individuals playing distinct roles:
- Jasveen Sangha (the “Ketamine Queen”) — The North Hollywood dealer who manufactured and supplied the illegal ketamine. Sentenced to 15 years federal prison, April 8, 2026.
- Erik Fleming — The middleman who purchased ketamine from Sangha and sold it to Iwamasa. His sentencing is scheduled for April 29, 2026 (faces up to 25 years).
- Kenneth Iwamasa — Perry’s personal assistant, who purchased the ketamine from Fleming and physically injected Perry with it. Sentencing: April 22, 2026 (faces up to 15 years).
- Dr. Salvador Plasencia — A physician who was involved in supplying ketamine. Sentenced to 2.5 years in federal prison in December 2025.
- Dr. Mark Chavez — Another physician involved in the supply. Sentenced to 8 months of home detention in October 2024.
Of all the defendants, Iwamasa held a uniquely personal relationship with Perry and bore the most direct responsibility for administering the fatal dose. While Sangha sold the drugs and Fleming facilitated the purchase, Iwamasa was the one who physically injected the ketamine into Perry on the day he died.
The Charges and Guilty Plea
Kenneth Iwamasa pleaded guilty in August 2024 to one count of conspiracy to distribute ketamine causing death. This is a serious federal charge under the Controlled Substances Act (21 U.S.C. § 841), and the “causing death” element dramatically increases the potential sentence.
Under federal law, a conviction for distribution or conspiracy to distribute a controlled substance that results in death carries a statutory maximum sentence of life imprisonment — though in practice, sentences of 10 to 20 years are more common for defendants without prior serious criminal records. In Iwamasa’s case, the agreed maximum exposure under his plea was 15 years (180 months).
Iwamasa’s decision to plead guilty early — in August 2024, shortly after indictment — is a factor that typically works in a defendant’s favor at sentencing. Federal judges can and do give credit for acceptance of responsibility under the US Sentencing Guidelines, which can result in a meaningful reduction from the guideline range. His cooperation with prosecutors is also expected to play a role in the judge’s determination.
Sentencing on April 22, 2026: What to Expect
Kenneth Iwamasa is scheduled to be sentenced by US District Judge Sherilyn Peace Garnett — the same judge who sentenced Jasveen Sangha — on April 22, 2026, in the US District Court for the Central District of California in Los Angeles.
What sentence Iwamasa will receive is a matter of significant public speculation. Several factors will influence the judge’s decision:
- His direct role: Iwamasa actually administered the fatal injections — putting him more directly in the causal chain than Sangha, who only sold the drugs. This could weigh toward a harsher sentence.
- Cooperation with prosecutors: If Iwamasa provided substantial assistance to investigators, the government may file a motion under USSG §5K1.1 (“5K motion”) recommending a reduced sentence. Such motions can significantly lower the sentence below the guideline range.
- Early guilty plea: Under federal sentencing guidelines, defendants who clearly demonstrate acceptance of responsibility can receive a 2 to 3 level reduction in their offense level — which can translate to significantly reduced prison time.
- The Sangha benchmark: Judge Garnett sentenced Sangha — who sold but did not administer the drugs — to 15 years. Iwamasa, who physically injected Perry, could face a similar or higher sentence. However, his cooperation and plea agreement may moderate this.
Defense attorneys are likely to argue for leniency based on Iwamasa’s relationship with Perry, the possibility that Perry was a willing participant in his own drug use, and any cooperation Iwamasa provided. Prosecutors, following the pattern set in the Sangha sentencing, may seek a sentence close to the statutory maximum.
How His Sentence Compares to Other Defendants
The Matthew Perry case has produced a range of sentences reflecting each defendant’s role and cooperation. For context:
- Dr. Mark Chavez: 8 months home detention — the lightest sentence, reflecting his more peripheral role and cooperation.
- Dr. Salvador Plasencia: 30 months (2.5 years) in federal prison — a mid-range outcome for a doctor who supplied ketamine.
- Jasveen Sangha: 15 years (180 months) federal prison — the harshest sentence to date, reflecting her role as a large-scale dealer who continued operating after knowing her drugs had killed someone before.
- Kenneth Iwamasa: Sentencing April 22, 2026 (up to 15 years maximum).
- Erik Fleming: Sentencing April 29, 2026 (up to 25 years maximum).
Legal observers note that while Iwamasa’s role was extremely serious — he was, after all, the person who administered the fatal injections — his sentence may end up below Sangha’s if he received credit for cooperation and his early guilty plea. The 2.5 years given to Dr. Plasencia and Sangha’s 15 years illustrate how dramatically sentences can differ based on role and cooperation.
Federal Prison Explained
If sentenced to federal prison, Kenneth Iwamasa will enter the Bureau of Prisons (BOP) system. The federal prison system differs significantly from state prisons:
- No traditional parole: Federal parole was abolished by the Sentencing Reform Act of 1984. Inmates cannot be paroled early based on a parole board review.
- 85% rule: Federal inmates must typically serve at least 85% of their sentence, minus any “good time credits” earned for good behavior (up to 54 days per year under existing law).
- First Step Act credits: Under the First Step Act (2018), inmates who participate in approved rehabilitation programs can earn additional earned time credits toward early placement in a halfway house or home confinement.
- Designation: The BOP assigns inmates to specific facilities based on their security level, gender, medical needs, and proximity to family. At 60 years old, Iwamasa could be designated to a low-security facility.
With a sentence of, say, 8 to 10 years, Iwamasa could realistically serve 6.5 to 8.5 years with good time credits. At 60, a sentence in that range would mean his release in his late 60s to early 70s.
For more information about how federal sentencing works, see our guides on federal prisons in the US, federal sentencing guidelines, and how the First Step Act affects federal sentences.
Frequently Asked Questions
What did Kenneth Iwamasa plead guilty to?
Kenneth Iwamasa pleaded guilty in August 2024 to one count of conspiracy to distribute ketamine causing death. The charge is a federal felony under the Controlled Substances Act. The “causing death” element means the maximum sentence under the plea arrangement was 15 years in federal prison.
When is Kenneth Iwamasa being sentenced?
Kenneth Iwamasa is scheduled to be sentenced on April 22, 2026, by US District Judge Sherilyn Peace Garnett in the US District Court for the Central District of California in Los Angeles. His sentencing comes 14 days after drug dealer Jasveen Sangha — the “Ketamine Queen” — received a 15-year sentence in the same case.
How long could Kenneth Iwamasa go to prison?
Iwamasa faces a statutory maximum of 15 years (180 months) in federal prison. The actual sentence will depend on factors including his cooperation with prosecutors, the federal sentencing guidelines calculation for his specific offense, and the judge’s assessment of the circumstances. Given that he administered the fatal dose but pleaded guilty early, legal experts suggest his sentence may range from several years to the full 15-year maximum.
Did Kenneth Iwamasa cooperate with prosecutors?
Court records indicate that Iwamasa pleaded guilty in August 2024, shortly after his indictment, which is generally taken as a sign of cooperation. However, the extent of any formal cooperation agreement — and whether prosecutors filed a 5K1.1 motion recommending a reduced sentence — has not been publicly confirmed as of the time of writing. Any cooperation credit is likely to be discussed at or before the April 22 sentencing hearing.
Where will Kenneth Iwamasa go to prison?
The specific federal prison (Bureau of Prisons facility) where Iwamasa will serve his sentence has not been determined. The BOP makes designation decisions after sentencing based on factors including security level, age, medical needs, and proximity to family. As a 60-year-old first-time federal offender, he is likely to be designated to a low-security Federal Correctional Institution (FCI), potentially in California or a nearby state.