The hateful letters were sent to her family by the fans, who blamed relatives for her demise after it emerged the Irish make-up artist had an argument with her mother before committing suicide last year, reported Mirror.
But the real reason behind her death only came out when letters from White, who was just 28 when she died, were revealed last month in which she had mentioned about feelings of hopelessness following her break-up with the 54-year-old "The Mask" star.
"We've had a terrible few months since Cathriona's death. There's been death threats and angry letters," Cathriona's stepfather Brian Sweetman said and they felt "huge relief" that letters were released.