The prosecution of five people in the drug death of actor Matthew Perry ended Wednesday with the sentencing of the personal assistant of the “Friends” star. Sixty-year-old Kenneth Iwamasa was at Perry's side in the final weeks of his life. Perry had been taking ketamine legally through his doctor, but about a month before his death began illegally seeking more. He found a doctor willing to provide it off the books, and a street dealer who gave him even more. On the last day of his life, Perry received about half a dozen injections. Iwamasa found him dead in the Jacuzzi of the home they shared.