Matthew Perry's parents wrote an emotional letter to the court, labeling the people facing years in prison for the late actor's death as "greedy jackals." Suzanne and Keith Morrison submitted a letter on Wednesday, December 3, ahead of Dr. Salvador Plasencia's sentencing. Per prosecutors, Plasencia, a.k.a. Dr. P of Santa Monica, pleaded guilty in July to four counts of distribution of ketamine. He is facing up to 10 years in prison on each count.