Erik Fleming pleaded guilty in 2024 to conspiracy to distribute ketamine and distribution of the drug resulting in death or serious injury, after connecting Perry with drug dealer Jasveen Sangha, known in Hollywood as the "Ketamine Queen".
She was jailed for 15 years last month.
In legal documents, prosecutors said Fleming helped distribute 51 vials of ketamine to Perry in October 2023, including the dose that caused his death.
Fleming, 56, submitted a letter to the court ahead of sentencing, describing how he too had struggled with addiction and saying he felt "overwhelmed with grief and shame" when he found out the star had died.
"I knew what I had done and understood how much pain his death would cause to the people who loved him," he wrote. "To Matt's family, I am very sorry for my inexcusable behaviour in this case.
"I take full responsibility for my criminal acts. I hope my sentence provides some measure of justice and peace for everyone who loved Matt."
Perry, 54, had struggled with substance addiction on and off for years before his death.
In his letter, Fleming described becoming certified as a counsellor after speaking to addicts about his own recovery. He said he met the Friends star a few times and was aware of his issues, but that in October 2023 he was "in the midst of a relapse" himself and "desperate" for money.
"I procured ketamine for Matthew Perry because I wanted the money and because I thought I was doing a favour for a friend," he wrote. "I never contemplated the worst possible outcome."
Telling the court he did not want his letter to be read "as an effort to minimise" his responsibility, he added: "This grievous failure will haunt me forever."
Fleming was the first of five defendants to plead guilty to charges related to Perry's death, in August 2024, before arrests were announced.
He is the fourth of the five to be sentenced, after Sangha and doctors Salvador Plasencia and Mark Chavez.
Plasencia was jailed for two-and-a-half years for illegally supplying ketamine to Perry in the weeks before his death.
Chavez was sentenced to eight months home confinement after admitting selling ketamine to Plasencia.
Kenneth Iwamasa, Perry's live-in assistant, is to be sentenced in May.
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Alex Murdaugh, 57, was given two consecutive life sentences in March 2023 after being convicted over the deaths of Margaret Murdaugh and their younger son Paul Murdaugh.
In a case that drew widespread attention, he was found guilty of fatally shooting his 52-year-old wife with a rifle outside dog kennels on their rural Colleton County property in South Carolina on 7 June 2021.
He was also convicted of shooting 22-year-old Paul twice with a shotgun on the same day.
Murdaugh, who found the two bodies outside their home, denied the charges.
But the convictions have now been overturned by the South Carolina Supreme Court and ordered a retrial, which prosecutors say will take place.
In a unanimous ruling, the justices said on Wednesday that Murdaugh was denied a fair trial because of the "improper external influences on the jury" by the then clerk of Colleton County Court, Becky Hill.
She "placed her fingers on the scales of justice", the court wrote, accusing her of "shocking" interference by suggesting to jurors they could not trust Murdaugh's testimony.
The justices also said the trial judge went too far in allowing evidence of Murdaugh's financial crimes into his murder trial.
Prosecutors had said the lawyer carried out the killings in an effort to distract from the fact he had been stealing millions of dollars from the family firm and clients to feed his drug habit.
But the new ruling does not mean Murdaugh will walk free from prison.
He is currently serving a 40-year federal sentence after pleading guilty to stealing around $12m (£8.8m) from his clients.
The justices ruled Hill, who oversaw the evidence and the jury during the trial, influenced jurors to find Murdaugh guilty.
She allegedly hoped to improve sales of a book - Behind the Doors of Justice: The Murdaugh Murders - that she was writing about the case.
It was pulled from publication after accusations of plagiarism.
"As her book's title suggests, it turns out Hill was quite busy behind the doors of justice, thwarting the integrity of the justice system she was sworn to protect and uphold," the justices wrote in a 27-page ruling.
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Hill pleaded guilty last year to criminal charges for showing sealed court exhibits to a photographer and lying about it in court. She was sentenced to a year of probation.
"There is no excuse for the mistakes I made. I'm ashamed of them," Hill said in a statement to the court.
The sprawling legal drama has been adapted into podcasts, books, and a TV miniseries. There has also been a docuseries on the case.
The cruise liner Ambition, which set sail from Belfast on 8 May, on a 14-night tour of western France and Spain, has seen dozens of cases of suspected gastroenteritis among those onboard.
The vessel called at Liverpool on Saturday and cases of gastroenteritis were said to have risen after passengers boarded at that stop.
There is no reason to link what looks like a stomach flu outbreak on the ship with the hantavirus cluster on the luxury MV Hondius ship, the regional health authority said.
Gastroenteritis is the most common cause of the "winter vomiting bug" or "stomach flu".
Ambassador Cruise Line confirmed that as of 13 May, there were 48 active cases of gastrointestinal illness onboard Ambition among guests, and one case among the crew.
The company also confirmed that a 92-year-old man died onboard on Friday, but stressed the guest did not report any gastrointestinal illness symptoms and the cause of death has yet to be established, pending a coroner's report.
French authorities made the decision ahead of the vessel's scheduled call into Bordeaux.
While docked in the French city, authorities carried out a routine review of the ship's health status and records.
While on board, the specialist medical team collected existing samples for laboratory testing at Bordeaux University Hospital, with results requiring a minimum of six hours to be processed.
Passengers and crew will only be able to disembark once clearance is granted after the investigation and testing are completed.
Guests who were due to travel on excursions will receive a full refund, the company said.
Essex-based operator, Ambassador Cruise Line, said in a statement: "The health, safety and well-being of our guests and crew remains our highest priority, and we are sincerely grateful for the patience, understanding and cooperation shown while these precautionary measures remain in place.
"We continue to work closely with the relevant authorities and will provide further updates as soon as additional information becomes available."
The ship is carrying a total of 1,187 guests, the majority of who are British, and 514 crew.
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Enhanced sanitation was put in place across the ship following the initial reports of illness, a spokesperson for the cruise liner added.
These include increased cleaning and disinfection measures in public areas, assisted service in selected dining venues and ongoing guidance to guests regarding hand hygiene.
Viral gastroenteritis is often caused by viruses like norovirus, rotavirus, and adenovirus.
While an initial infection often provides some immunity, it's possible to catch a stomach virus in back-to-back weeks, usually due to a different strain.
Joshua Coates' attack on the four-month-old child caused her to suffer a widespread brain injury.
Sentencing him at the High Court in Glasgow on Wednesday, Judge Lord Young told him: "You also inflicted bruising and abrasions to her face and body.
"After she was admitted to hospital, further X-rays revealed fractures of both wrists which, based on the stage of healing, must have been inflicted by you a few days before the shaking incident."
The court heard how the child currently suffers from cerebral palsy in all four limbs and impaired vision.
Lord Young said the youngster's gross and fine motor skills had also been affected.
And though she is "making progress", the judge said, "it seems inevitable that she will be left with some permanent impairments requiring assistance throughout her life".
The attempted murder occurred in Arbroath, Angus, on 4 August 2023.
A probe was launched after the girl was admitted to Ninewells Hospital in Dundee with significant head injuries.
Coates, 25, denied any wrongdoing but was convicted at the High Court in Dundee in March.
Lord Young said the attacker's evidence was "inconsistent" during the trial.
While completing his criminal justice social work report, Coates also provided a new version of events in which he suggested "another person caused these injuries".
However, his defence lawyer said he had ultimately accepted responsibility for inflicting the injuries.
The judge noted the defendant's ADHD and anger management issues, and acknowledged that measures had been agreed that he should not be left alone with the child.
Lord Young added: "But tragically, another person put their own interests before that of the baby and left the baby in your sole care overnight.
"While you should never have been left alone with the baby that night, that is absolutely no excuse for what you did."
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Detective Constable Jamie Thomson said the 11-year sentence reflected the "seriousness of the violence inflicted on a completely defenceless child".
He said: "The injuries sustained by the baby have been life-changing and could easily have had fatal consequences.
"Our thoughts remain with child and her family as they continue their recovery from this traumatic ordeal."
The detective urged those with concerns about the safety or welfare of a child to contact Police Scotland on 101.
He added: "Cases involving harm to children are among the most difficult we deal with.
"However, Police Scotland is committed to thoroughly investigating such incidents and ensuring those responsible are held accountable."
This week has seen blustery showers and cooler than average temperatures across parts of the country.
But forecast models are now indicating the temperatures for many areas will begin to rise from next week.
Sky News meteorologist Dr Christopher England said it was "very early days" for specific details and there was a "great deal of uncertainty in any forecast".
But he added: "Long range weather models suggest that high pressure will build to the west of the UK into the last week of May, with a southerly flow bringing higher than average temperatures for a time at least, likely reverting towards the mean later."
Check the forecast for your area
Early forecasts for the period of 17 to 26 May show temperatures will "recover" before warmer conditions arrive for some parts.
The Met Office said: "As this period progresses, high pressure is likely to begin to build from the south bringing more in the way of settled weather.
"Temperatures likely cooler than average to begin, but tending to recover as the period progresses, perhaps becoming rather warm by the end of the period, especially in the south."
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But unsettled conditions look set to "dominate" the early stages of this period, potentially bringing "rain or showers, some of which could be heavy, for many places," the agency added.
Reports citing other forecast models suggest temperatures could climb to at least 25C by the end of the month across many regions of the UK.
The Met Office currently says "patterns which bring more settled weather are more likely to dominate towards the end of May" and there is "likely to be longer spells of fine and dry weather".
Any spells of very warm conditions may also increase fears of drought conditions in the summer after the Met Office revealed several counties had experienced one of their driest Aprils on record.