Perry's family and possibly others affected by his death will have a chance to make a statement in federal court in Los Angeles before the sentencing of Dr Salvador Plasencia on Wednesday.
Prosecutors are asking US District Judge Sherilyn Peace Garnett to sentence Plasencia, 44, to three years in prison after a plea agreement where the doctor admitted to illegally selling Perry large amounts of ketamine.
He was not accused of selling the actor the dose that investigators say killed him on October 28, 2023.
Perry had been taking the surgical anaesthetic ketamine legally as a treatment for depression.
But when his regular doctor would not provide it in the amounts he wanted, he turned to Plasencia, who admitted to illegally selling to Perry despite knowing he was a struggling addict.
He texted another doctor that Perry was a "moron" who could be exploited for money, according to court filings.
"Rather than do what was best for Mr Perry - someone who had struggled with addiction for most of his life - defendant sought to exploit Perry's medical vulnerability for profit," the prosecution's sentencing memo said.
Plasencia's lawyers tried to give a sympathetic portrait of him in their memo, as a man who rose out of poverty to become a doctor beloved by his patients, some of whom provided testimonials about him for the court.
The lawyers called his selling to Perry "reckless" and "the biggest mistake of his life".
But they wrote that a jail sentence was "neither necessary nor warranted", given he had already lost his medical licence and his career, had been attacked in the media, and been forced to move his family to another state for their safety.
Plasencia pleaded guilty in July to four counts of distribution of ketamine. Prosecutors agreed to drop five different counts.
The agreement came with no sentencing guarantees, and legally Garnett can give him up to 40 years.
The other four defendants who reached deals to plead guilty will be sentenced at their own hearings in the coming months.
Perry struggled with addiction for years, dating from his time on Friends, when he became one of the biggest stars of his generation as Chandler Bing.
He starred alongside Jennifer Aniston, Courteney Cox, Lisa Kudrow, Matt LeBlanc and David Schwimmer for 10 seasons from 1994 to 2004 on NBC's mega-hit sitcom.
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