Nor is de Vries able to cheat cosmic karma, as he is killed by a potent poison released by Duke Leto Atreides. As the nephew of Baron Harkonnen, Glossu "Beast" Rabban serves as his uncle's ...

Wellington Yueh was a medical professional and the personal physician of Duke Leto Atreides prior ... he equipped Leto Atreides with a poison capsule for use against Baron Harkonnen.