Cordelia Scaife May (September 24, 1928–January 26, 2005) — known as "Cordy" to family and friends — was a Pittsburgh, Pennsylvania-area political donor and philanthropist and one of the wealthiest women in the United States. In the year of her death, she was recognized as the single most generous person in the country. May was occasionally labeled as reclusive.
May was the only daughter of Alan Magee Scaife and Sarah Cordelia Mellon Scaife, daughter of Richard B. Mellon and niece of Andrew W. Mellon. She was raised with her brother Richard Mellon Scaife at the family estate in Ligonier and prepared at Foxcroft School.
She attended Carnegie Institute of Technology, now known as Carnegie Mellon University, and the University of Pittsburgh briefly, but left school to marry longtime family friend Herbert A. May, Jr. on June 30, 1949. The couple divorced after scarcely a year, and she resumed a childhood friendship with Allegheny County District Attorney, Robert Duggan, which blossomed into a romantic relationship. They secretly wed on August 29, 1973 amidst a federal investigation by then-United States Attorney Dick Thornburgh into allegations of racketeering and corruption on Duggan's part. On March 5, 1974, Duggan was found dead of shotgun wounds hours before being indicted by a federal grand jury on charges of income tax evasion. The death was ruled either an accident or suicide. May maintained that he was murdered, although she never said by whom. Her brother's disapproval of their relationship led to a longtime estrangement between the siblings.