Kenneth Iwamasa pleaded guilty to conspiracy to distribute ketamine resulting in death and became the prosecution’s most important witness.

Kenneth Iwamasa, who pleaded guilty last year to one count of conspiracy to distribute ketamine causing death, said he "will forever regret" his actions.

Kenneth Iwamasa had pleaded guilty to one count of conspiracy to distribute ketamine resulting in death. As part of a plea agreement, he admitted to repeatedly injecting Perry with ketamine without medical training, including the lethal dose.

The personal assistant who injected Friends star Matthew Perry with a fatal dose of the hallucinogenic drug ketamine has been sentenced to 41 months in a US federal prison.

Kenneth Iwamasa, who pleaded guilty last year to one count of conspiracy to distribute ketamine causing death, said he "will forever regret" his actions.

May 27 (UPI) -- Kenneth Iwamasa, a personal assistant who worked for Friends actor Matthew Perry, was to be sentenced Wednesday for injecting Perry with the dose of ketamine that killed him.

Matthew Perry’s live-in personal assistant, who injected him with the fatal dose of ketamine, was sentenced Wednesday to three years and five months in prison.

Kenneth Iwamasa, who pleaded guilty last year to one count of conspiracy to distribute ketamine causing death, said he "will forever regret" his actions.

Kenneth Iwamasa was sentenced to three years and five months in federal prison for injecting Perry with multiple doses of ketamine before his death.