By Reuters Staff THE HAGUE (Reuters) - Dutch authorities are investigating 33 suspected deaths of people who bought a suicide powder from a member of a right-to-die group in the Netherlands, prosecutors said on Wednesday. The number of cases surfaced in procedural hearings ahead of a possible trial of several members of the group calling itself Cooperative Last Will. The number is expected to rise after another member of the group told a newspaper he had sold the powder to more than a hundred people. The cooperative, which has been promoting Substance X as a cheap and painless way to die since...