Plasencia has been accused of providing the bulk of the ketamine to Perry, and in the new plea agreement, he admitted to injecting the actor with ketamine at his home and in a car park in the weeks prior to his death.

Dr Salvador Plasencia will plead guilty to four counts of distributing ketamine, federal prosecutors said in a statement on Monday.

A former corporate lawyer at two large U.S. law firms pleaded guilty on Wednesday to charges stemming from his failure to pay federal income taxes.