A woman branded as the "Ketamine Queen" has pleaded guilty to selling Matthew Perry the drug that killed the Friends star.

Jasveen Sangha pleaded guilty on Wednesday (early Thursday AEST) to five federal charges, including providing the ketamine that led to Perry's death. Her trial had been planned to start later this month. She is the fifth and final defendant charged over Perry's overdose death to admit guilt.

Perry's mother, Suzanne Perry, and his stepfather, Dateline reporter Keith Morrison, sat in the audience.

Prosecutors had cast Sangha, a 42-year-old citizen of the US and the UK, as a prolific drug dealer who was known to her customers as the "Ketamine Queen", using the term often in press releases and court documents.

Making good on a deal she signed on

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