 We all know the substance that took the life of Matthew Perry, but who all was involved in getting him that substance? Well, the investigation into his death is nearing its end. Michael Kastner reports. That's according to ABC News, citing sources within the Los Angeles Police Department and U.S. Attorney's Office. Investigators are working to determine who supplied the ketamine that led to the 54-year-old Perry's death at his home in Pacific Palisades last October.