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Matthew Perry’s Assistant Sentenced to 41 Months, Closing Federal Case

Prosecutors allege injection of illicit ketamine followed by efforts to conceal evidence with his cooperation leading to a reduced sentence

Overview

  • Kenneth Iwamasa was sentenced Wednesday to 41 months in federal prison, two years of supervised release and a $10,000 fine and must report to custody in mid‑July.
  • Iwamasa pleaded guilty in August 2024 to conspiracy to distribute ketamine resulting in death and admitted repeatedly injecting Perry, including multiple doses on the day the actor was found dead.
  • Prosecutors told the court that after Perry’s death Iwamasa directed disposal of vials and syringes, deleted files and altered device passwords, actions they say amounted to evidence concealment.
  • Perry’s family submitted victim impact statements blaming Iwamasa for enabling the actor’s addiction and for betraying the trust placed in a live‑in assistant paid to help maintain sobriety.
  • The prosecution traced a hybrid supply chain of illicit ketamine through doctors, a counselor and a dealer known as the “Ketamine Queen,” raising questions about off‑label prescribing, monitoring of controlled substances and safeguards for vulnerable patients.