He had surgery to remove the tumor and underwent radiation and chemotherapy treatments.
Lietzke suffered a setback in April 2018 after testing revealed tumors had returned in his brain, according to The News, a newspaper in Port Arthur, Texas.
The Beaumont, Texas, native played golf at the University of Houston and started his career as a professional golfer in 1974, according to Golf Digest.
He won seven times on the PGA Tour Champions, including the U.S. Senior Open in 2003.
He also played for the U.S. Ryder Cup team in 1981.