The man who injected Matthew Perry with the fatal dose of ketamine was not some shadowy drug dealer — he was Perry’s trusted live-in personal assistant, earning $150,000 a year to make the actor’s life easier, right up until he made it end.
Story Snapshot
- Kenneth Iwamasa, Perry’s former live-in personal assistant, was sentenced to 41 months in federal prison on May 27, 2026.
- Iwamasa pleaded guilty in August 2024 to conspiracy to distribute ketamine resulting in death and serious bodily injury.
- Prosecutors say he obtained ketamine, injected Perry multiple times per day, and administered the final fatal dose.
- Iwamasa is the last of several defendants sentenced in connection with Perry’s October 2023 death.
The Man Closest to Perry Was Also the Most Dangerous Person in the Room
Kenneth Iwamasa was not a fringe figure in Matthew Perry’s life. He lived with the actor, managed his daily needs, and earned a salary that placed him comfortably in the upper-middle class.
According to the Los Angeles Times, Iwamasa made $150,000 a year working for Perry. That proximity, and the trust that came with it, is exactly what made his role in Perry’s death so devastating and so legally significant. [5]
The Department of Justice states that Iwamasa was sentenced for obtaining and repeatedly injecting Perry with ketamine, including the fatal dose that ended Perry’s life. This was not a single reckless moment.
Prosecutors described a pattern of multiple injections per day, a routine that Iwamasa carried out not as a medical professional but as someone who had completely abandoned any duty of care to the man who trusted him most. [2]
A Guilty Plea That Left No Room for Doubt
Iwamasa pleaded guilty in August 2024 to one count of conspiracy to distribute ketamine resulting in death and serious bodily injury. That charge carries serious weight.
Federal conspiracy charges in drug-death cases require prosecutors to prove not just that drugs were distributed, but that the distribution was part of a coordinated effort and that it caused the victim’s death. Iwamasa’s guilty plea means he did not contest those facts in court. [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
The 41-month sentence — just over three years and five months — closes the final chapter of a criminal case that ensnared multiple defendants. Iwamasa is the last to be sentenced, meaning the full legal reckoning for Perry’s October 2023 death has now run its course.
Whether the sentences handed down across all defendants feel proportionate to the loss of a beloved cultural figure is a question Perry’s family and fans will carry long after the courtroom doors close. [1]
A Criminal Network, Not Just One Bad Actor
The prosecution’s case was never built around Iwamasa alone. The Department of Justice described a distribution-and-administration chain that included a physician and a ketamine supplier, with Iwamasa functioning as the person who physically administered the drug to Perry daily.
That structure matters. In drug-related death prosecutions, criminal responsibility is often distributed across a network, and each participant’s role is evaluated based on proximity, knowledge, and action. Iwamasa’s role checked all three boxes. [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
Perry’s mother, Suzanne Morrison, and her husband, journalist Keith Morrison, attended the final sentencing hearing. Their presence was a reminder that behind every federal docket number is a family that does not get to move on simply because a judge has spoken. The legal system delivered its verdict. The grief does not come with a sentence date. [1]
What This Case Reveals About Wealth, Dependency, and Exploitation
There is a deeply uncomfortable truth embedded in this case. Perry was wealthy, famous, and by all accounts struggling with addiction. Those three conditions together create a vulnerability that predatory or negligent people can exploit, whether intentionally or through sheer moral failure.
Iwamasa’s willingness to inject his employer with ketamine multiple times a day — and ultimately administer a fatal dose — represents a catastrophic collapse of the basic human obligation not to harm the person depending on you. [2]
Personal accountability matters, and Iwamasa’s guilty plea confirms he bore direct, hands-on responsibility for Perry’s death.
A 41-month sentence for a role this central and this fatal will strike many as lenient—the facts as established by the Department of Justice support that skepticism. When the person you trust most becomes the instrument of your death, the law owes the victim more than a middling prison term. [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 …
[5] YouTube – Matthew Perry’s former assistant sentenced to 41 months in actor’s …
