Matthew Perry‘s stepmother is speaking out ahead of today’s sentencing of the “Ketamine Queen” … urging the court to give her the maximum prison term.

Debbie Perry submitted a victim impact statement Tuesday to the U.S. district court overseeing the prosecution of Jasveen Sangha — AKA the “Ketamine Queen” — describing the pain caused by the “heartless” Sangha as “irreversible.”

Debbie wrote her statement like a poem … “There is no joy… No light in the window. They won’t be back.”

Sangha’s is set to sentenced Wednesday … she’s been in federal custody since August 2024, pleading guilty last fall to 5 federal charges related to Matthew’s 2023 death. Sangha has admitted to selling dozens of vials of liquid ketamine to Matthew in October 2023, and prosecutors say she used a middleman to distribute them.

In a March filing, federal prosecutors asked for a 15-year prison sentence followed by three years of supervised release. They reasoned she never stopped selling ketamine to her clients … even after knowing she was responsible for Matthew’s death. Prosecutors said her actions showed “a cold callousness and disregard for life.”

We broke the tragic news — Matthew was found face down in the backyard pool of his Pacific Palisades, California home on Oct. 28, 2023. He was pronounced dead at the scene.

In total, 5 people were charged in relation to the “Friends” star’s death … 2 doctors — Salvador Plasencia and Mark Chavez — the actor’s assistant Kenneth Iwamasa — who injected him with the drug multiple times before his death– Matthew’s acquaintance Erik Fleming, and Sangha herself.

Plasencia was sentenced to more than 2 years in prison and Chavez got 8 months of home confinement plus 3 years of supervised release for their roles in Matthew’s death.