Matthew Perry’s Former Assistant Sentenced to 41 Months in Ketamine Case

Overview

• Kenneth Iwamasa was sentenced to 41 months in prison on May 27, 2026, after pleading guilty in 2024 to a conspiracy to distribute ketamine linked to Matthew Perry’s death.
• Prosecutors say Iwamasa administered more than 25 ketamine injections to Perry in the days before the actor’s October 28, 2023 death, including multiple injections on the day he was found unconscious in his Los Angeles jacuzzi.
• Court filings accompanying the sentence allege Iwamasa tried to erase traces of ketamine, recruited someone to clean the scene after Perry’s death, and lied to investigators, and prosecutors had recommended a 41-month term.
• Perry’s sisters told the judge they felt betrayed and said Iwamasa gave their brother the last lethal dose, stayed for funeral events, and tried to extort their mother, details they included in victim-impact filings.
• The case has produced several convictions that reveal an illicit ketamine supply chain and alleged medical exploitation, including a supplier sentenced to 15 years and a producer and two doctors who have also been convicted.