Seay died Saturday in his home after a lifetime of philanthropic contributions to organizations benefiting children, animal welfare, education and the arts, said his daughter, Sally Stout.
"It's their love of children that started this whole thing. It's been a lifelong passion," Stout said of her parents' support of charitable causes in a story in The Dallas Morning News.
The donations Seay and his wife, Sarah "Sadie," made to UT Southwestern helped bolster the hospital's pediatric emergency services and intensive care unit and funded numerous research programs. The couple also donated millions of dollars to animal welfare organizations, the Dallas Museum of Art, the Dallas Symphony Orchestra and the Dallas Center for the Performing Arts Foundation.
Seay began his career as an insurance agent and eventually started a business specializing in life-insurance common stocks and securities.
He is survived by his wife and daughter and sons Bob and Steve and four grandchildren. Another son, Charles Jr., preceded him in death.