Piper defended alternative medicine, animal rights and the past activities of Liberty Lobby and Willis Carto. He was featured as a guest on James Edwards' radio show, The Political Cesspool, which has also been accused of promoting anti-Semitism.

Piper was invited to Iran to speak at the International Conference On Review of the Holocaust: Global Vision 2006, and personally met with Iranian president Mahmoud Ahmadinejad, a Holocaust denier, during his New York City visit to address United Nations General Assembly.

Piper's body was discovered on May 30 or May 31, 2015 at the Budget Saver Motel in Coeur d'Alene, Idaho. The deputy coroner's report stated that the cause of death was a "probable Myocardial Infarction, Ischemic Cardiomyopathy and Coronary Artery Disease", and listed diabetes as another significant condition. The report indicated that toxicology results were consistent with her findings and that no autopsy was conducted. The article gave Piper's age as 54.

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