Although he enrolled in a cancer vaccine study in an attempt to ward off the disease,Wayne died of stomach cancer on June 11, 1979, at the UCLA Medical Center, and was interred in the Pacific View Memorial Park cemetery in Corona del Mar, Newport Beach. According to his son Patrick and his grandson Matthew Muñoz, a priest in the California Diocese of Orange, he converted to Roman Catholicism shortly before his death.

More information: Rochman, Sue (Fall 2008). "The Duke's Final Showdown". CR (American Association for Cancer Research). Archived from the original on January 17, 2012. Retrieved July 30, 2011.

More Info: en.wikipedia.org