The former assistant of  Friends  star Matthew Perry reported to federal prison Monday to start serving his sentence related to the actor's 2023 ketamine overdose death.

Kenneth Iwamasa, 61, had been ordered to surrender by noon on Friday to start his prison sentence.

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In May, Iwamasa was sentenced to three years and five months in federal prison for injecting Perry with multiple doses of ketamine before his death. He also faces two years of supervised released and was ordered to pay a $10,000 fine to the U.S. government.

The actor's ex-employee bought the ketamine that caused Perry's death and injected him with the fatal dose.

As part of a plea agreement, Iwamasa pleaded guilty in August 2024 to one count of conspiracy to distribute ketamine resulting in death. As the first defendant to reach a plea deal with prosecutors, Iwamasa was a key witness for the prosecution in the cases against the other defendants.

Iwamasa was the central figure in the 2 1/2-year investigation. He was the last of five defendants to face prison time in the October 2023 death of the 54-year-old Perry at his Pacific Palisades residence.

Perry had hired Iwamasa in 2022, and he was paying him $150,000 a year to live at his Los Angeles home and act as his assistant.

The actor had been taking the surgical anesthetic ketamine legally for depression, an increasingly common off-label use. But he wanted more than his doctor would give him.

According to Iwamasa's plea agreement, he bought off-the-books ketamine from another doctor, Salvador Plasencia, who taught him how to inject it. Plasencia was sentenced to 2 1/2 years in prison in July.

Iwamasa also began buying ketamine from Perry acquaintance Erik Fleming, who was getting it from a street dealer. Fleming was sentenced to two years in prison two weeks ago.

The dealer, Jasveen Sangha, dubbed  The Ketamine Queen,  was sentenced to 15 years on April 8.

n the final days of Perry's life, Iwamasa was injecting him six to eight times per day. On Oct. 23, 2023, he shot the 54-year-old 

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