Investigators probing Matthew Perty’s death are reportedly still looking into how the “Friends” actor got a hold of the ketamine that was found in his system at the time of his death — and are trying to zero in on who is responsible for supplying him with the deadly drug.

The 54-year-old actor, who long struggled with addiction, was found dead in his hot tub in October with enough of the drug equivalent to the general anesthesia given to surgical patients.

Law enforcement sources told TMZ there is an ongoing investigation into where Perry got the ketamine — and who provided him with the toxic drug.

Both local police and the DEA are reportedly involved in the investigation.

Sources told TMZ that authorities have already interviewed key people in Hollywood, namely people who have a history of drug use or abuse.

No arrests have been made.