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Matthew Perry’s assistant is last to be sentenced over his ketamine death

Prosecutors say he repeatedly injected Perry with ketamine and helped hide evidence, and they are seeking 41 months in prison.

  • Kenneth Iwamasa, 60, faced sentencing Wednesday in Los Angeles federal court for administering the ketamine dose that killed Matthew Perry on October 28, 2023, after pleading guilty to conspiracy to distribute ketamine resulting in death.
  • Perry had been legally taking surgical anesthetic ketamine for depression but wanted more than his doctor prescribed; around September 2023, Perry requested Iwamasa's help obtaining illegal doses, transforming their relationship from caretaker to enabler.
  • Throughout October 2023, Iwamasa repeatedly injected Perry with ketamine without medical training, witnessing him unconscious at least twice and unable to speak after large injections, yet continued administering six to eight shots daily until the fatal dose on October 28.
  • Iwamasa initially concealed evidence by cleaning up ketamine bottles and syringes and omitting the drug from Perry's medication list when questioned by police, but began cooperating after investigators served a search warrant in January 2024, becoming crucial to prosecuting co-defendants.
  • Prosecutors sought 41 months in prison, significantly less than Iwamasa's 15-year maximum but more than most co-defendants, while Perry's mother Suzanne Morrison wrote his 'number-one responsibility' was ensuring Perry remained drug-free, and sisters Caitlin and Madeline described him leaving their brother 'in a hot tub to die.
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On October 28, 2023, Chandler Bing's unforgettable interpreter was found dead at his home in Los Angeles. A death caused by an overdose of ketamine, notably administered by his personal assistant Kenneth Iwamasa. While he is awaiting his verdict, another overwhelming revelations were revealed.

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Kenneth Iwamasa faces up to 41 months in prison

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arcamax.com broke the news on Tuesday, May 26, 2026.
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