Assistant Seeks Lighter Sentence for Matthew Perrys Influence

The following day, Morrison was able to 'see him in a mortuary,' where Perry had 'been bathed and dressed.'

She wrote that her son 'looked almost beautiful and somehow relieved, like a gladiator who has finally earned his rest.'

Morrison's letter also delved into Perry's decades-long battle with substance abuse.

'Matthew fought for half his life – more than half – against addiction. Fought and failed and came back to fight again,' she continued.

Once the subject turned to Iwamasa, whom she calls 'Kenny,' Morrison called out his alleged 'treachery.'

She said that it was such a 'relief' when Perry hired Iwamasa, because they all 'believed' that he truly 'understood' Perry's struggles over the 25 years they worked together.

'Matthew trusted Kenny. We trusted Kenny,' Morrison continued, writing that 'Kenny's most important job' was to be Perry's 'companion and guardian in his fight against addiction.'

According to her, Iwamasa's primary responsibility was to 'ensure that Matthew remained what he wanted to be: drug free.'

'Kenny knew, should he feel unduly pressured, that with one phone call to any number of the people in Matthew’s orbit, reinforcements would be on the way, and his job would be safe,' she added.

'But instead of protecting Matthew, he aided and abetted illegal drug taking, arranged for one source of supply, then another,' Morrison wrote in a fury. 'Shot the drugs into Matthew’s body though he was not in the least qualified.'

'He did it even though he could see, anyone could have seen, it was so obviously dangerous,' she continued. 'And he did it again and again.'

Morrison was particularly incensed at how Iwamasa tried to be a support to her after Perry's death, despite having administered multiple doses of ketamine to him on his last day.

'And when he had killed my son, he kept a sharp eye on me. He sent me songs, he drew a little map to help me find my way around the cemetery,' Morrison wrote. 'If he saw a rainbow – one of Matthew’s favorite things – he would call me.'

She said that Iwamasa even 'insisted on speaking at Matthew’s funeral' and 'clung to me and the family as if he was somehow the good guy who tried to save Matthew.'

Morrison claimed that, 'all along, he seemed to be watching me, checking…did I know something?'

She went on to accuse Perry's assistant of threatening 'legal action to pry a settlement from workmen's comp' after it 'became obvious there would be no financial payout for him.'

Ultimately, she wrote, 'We trusted a man without a conscience, and my son paid the price.'

After praising the detectives who investigated the circumstances behind Perry's death and the judge, Morrison mused on whether 'closure' is even possible for her.

'I have to say this: the word "closure." Such a thing doesn’t exist,' she concluded. 'Ask any mother whose child has been torn away so mercilessly. Nothing takes this pain away, nor will it, I am sure, for as long as I live.'

Also included in the latest filing from prosecutors was a letter written by Perry's half-sister Madeline Morrison, whom Suzanne shares with her husband, Dateline correspondent Keith Morrison.

She began her letter by admitting that it's 'difficult to put into words the sense of betrayal I felt when I found out what Kenny had done.'

'The idea that someone my brother considered family could betray him in such an unimaginable way is something I never could have conceived,' she wrote.

Madeline said that learning of Iwamasa's alleged deceptions made it feel as if her brother had 'died all over again.'

'Everything I believed about the day he died – everything Kenny told us – was a lie,' Madeline claimed. 'I had to relive Matthew’s death from an entirely new and devastating perspective.'

She wrote that, in hindsight, 'certain moments now feel painfully clear' as she described 'how manic and unsettled Kenny seemed' as she and her sister chose clothes for him to be buried in.

Madeline also claimed that Iwamasa 'repeatedly volunteered his version of events without being asked, as if he were being interviewed rather than mourning a friend.'

'At the time, I told myself he was simply in shock, grieving as we all were,' she wrote. 'In reality, he was trying to distract us from the truth: that he had injected my brother with a lethal dose of ketamine and left him in a hot tub to die.'

She also addressed Iwamasa's speech at Perry's funeral, calling it a 'cruel joke.'

'He didn’t just take my brother’s life – he tainted our final memories of saying goodbye,' Madeline said.

She went on to recall a moment during the trial of Jasveen Sangha, who was sentenced to 15 years in prison, the harshest of the sentences so far, after she pleaded guilty to three counts of distribution of ketamine, one count of distribution of ketamine resulting in death or serious bodily injury and one count of using her home for drug distribution, according to the Associated Press.

'Your honor, you asked counsel a question at the sentencing of Jasveen Sangha about who was more culpable...the drug dealer responsible for supplying the drugs that killed my brother, or the so-called loyal assistant who bought the drugs by any means necessary, injected him with a lethal dose and left him to die,' Madeline recalled. 'I think it's safe to guess what my answer would be.'

Iwamasa's upcoming sentencing hearing follows sentencing for the licensed drug counselor Erik Fleming, who pleaded guilty to one count of distribution of ketamine resulting in death and was sentenced to two years in prison, followed by three years of probation.

Dr. Salvador Plasencia also pleaded guilty to four counts of distribution of ketamine for supplying Perry with Ketamine beyond the amount that the actor's regular doctor was willing to prescribe.

He was sentenced to two-and-a-half years in prison, along with two years of probation and a $5,600 fine.

Dr. Mark Chavez, who provided the ketamine doses to Plasencia, pleaded guilty to one count of conspiracy to distribute ketamine, and he has already surrendered his medical license.

He was sentenced to eight months of home confinement and three years of supervised release.