Matthew Perry's assistant Kenneth Iwamasa is due to face sentencing after being charged in connection to the actor's death, and Perry's mother has sent a heartbreaking letter to the court11:26, 21 May 2026Matthew Perry's mother, Suzanne Morrison, has said she and her son "trusted a man without a conscience" ahead of assistant Kenneth Iwamasa's sentencing.‌Iwamasa was the first of five people implicated in the Friends star's 2023 death to reach a plea deal with prosecutors. He plead guilty to one count of conspiracy to distribute ketamine causing death and agreed to be a key witness against the others. As such, he will be the last of the five people charged in connection with the actor's death to be sentenced, with his hearing taking place on 27 May.‌Ahead of the proceedings, Morrison has sent a heartbreaking letter to the court, accusing him of "treachery".‌READ MORE: Lisa Kudrow reveals how much Friends stars make still on every episodeREAD MORE: Lisa Kudrow 'only realised how great Friends was' when Matthew Perry diedIn the letter, obtained by the Daily Mail, she said she initially felt "relief" when Iwamasa was hired as her son's assistant, because she believed he "understood" Perry's battle with drug addiction and "trusted" him. She said: "Matthew trusted Kenny. We trusted Kenny."She added that the most important part of his job was to be a "companion and guardian in [Perry's] fight against addiction" and to make sure he remained "drug free".‌Morrison explained that Iwamasa did not need to fear for his job if he refused Perry's requests for drugs, as "with one phone call" many who loved the late star would "be on the way" to provide "reinforcements".She heavily criticised him for injecting her son with ketamine, reportedly penning: "He did it even though he could see, anyone could have seen, it was so obviously dangerous. And he did it again and again and again."In further passages, she accused him of having "clung" to her after her son's death, claiming that he would call her if he saw a rainbow, as that was one of Perry's favourite things, and insisted on speaking at the funeral. She said he acted as though he was "the good guy who tried to save" her son.‌She concluded: "We trusted a man without a conscience and my son paid the price."In other letters, Morrison also described the heartbreaking moment she saw her son's dead body for the first time, recalling her frantic struggle to cover his body after he was found dead in a hot tub at his home on 28 October 2023. Morrison said helicopters were circling the property to get pictures.‌The next day, she went to the morgue and said he "looked almost beautiful" and "somehow relieved" after having fought a decades-long addiction battle.The filings the Mail obtained also included a letter from Perry's half-sister Madeline Morrison, who detailed how the "betrayal" she felt from Iwamasa was "difficult to put into words". She said that everything she first thought about the day her brother died was "a lie" because Iwamasa had lied to the family, meaning she had to "relive" the death later on.Iwamasa was one of the five people who were arrested and charged in connection with Perry's death. Jasveen Sangha was sentenced to 15 years in prison after pleading guilty to three counts of distributing ketamine, one count of distribution of ketamine resulting in death and another of using her home for drug distribution.‌Salvador Plasencia pleaded guilty to four counts of distribution of ketamine after prescribing Perry an amount of the drug that was higher than his regular doctor would prescribe. He was sentenced to two and a half years in prison, two years probation and a $56,000 fine.Erik Fleming, a licensed drug counsellor, pleaded guilty to one count of distributing ketamine and was sentenced to two years in prison and three years probation. Mark Chavez, who provided the ketamine doses to Plasencia, plead guilty to one count of distribution as well and has surrendered his medical license. He was sentenced to eight months of home confinement and three years of supervised release.Frank offers confidential advice about drugs and addiction (email frank@talktofrank.com, message 82111 or call 0300 123 6600) or the NHS has information about getting help.Article continues belowFor more of the latest showbiz news and gossip, follow Mirror Celebs on TikTok, Snapchat, Instagram, Twitter, Facebook, YouTube and Threads.