Nickerson was previously admitted to the hospital in June 2018 after having a stroke.
When they came back home and realized what happened they rushed her to the ER where her condition worsened.
At the time, Nickerson joked that doing the role didn't make her sick of chewing gum, but her dental health caused her to give it up for good. "We're telling her it's okay to let go", her son wrote before confirming her death.
After "Willy Wonka", she went on to appear in several other TV movies and series in the 1970s. Early Wednesday, they wrote on Facebook that she had been removed from machine support, including an IV drip giving her anti-seizure medicine and a "very strong oxygen pump". "We are heartbroken and reliving a grief we've lived every single day since she had the stroke over a year ago".
Ringside Report is sad to announce the passing of actress Denise Nickerson, star of 1971's WILLY WONKA AND THE CHOCOLATE FACTORY.
Denise Nickerson is survived by her son, Josh, and her daughter-in-law. It's the worst. She's breathing on her own but they can't remove the ventilator today because they don't think she has the strength to cough and not aspirate.
Jasmine also noted on the page her heartbreak for her husband. Then, when you watch it again when you get older, you realize just how dark and twisted the humor really is.
Born in New York City in 1957, Nickerson's first TV roles were on the gothic U.S. soap opera Dark Shadows as Amy Jennings and Nora Collins.
Denise's last film appearance was in 1978, as she chose to quit acting. She was even visited by her Willy Wonka costars Paris Themmen (Mike Teevee) and Julie Dawn Cole (Veruca Salt) last September.