United Kingdom, Dec. 3 -- Matthew Perry's parents have branded his doctor "among the most culpable of all" in their son's death.

The late Friends actor died from accidental drowning caused by the acute effects of ketamine use in October 2023, aged 54, and Dr. Salvador Placenscia was later one of five people convicted of crimes relating to his passing.

Ahead of the medic's sentencing on Wednesday (03.12.25), Matthew's parents submitted victim impact letters to the court in which they discussed their grief over the loss of their son and their anger towards those who played a part in his death.

According to Rolling Stone, a letter from the 17 Again actor's mother and stepfather, Suzanne and Keith Morrison, read: "How do you measure grief?...