Martha Stewart's younger sister, Laura Plimpton, died yesterday at her home in Weston, Connecticut, having suffered an apparent brain aneurysm.
Her famous sibling shared a tribute on her official website.
"My youngest sister, and the youngest of the six Kostyra siblings, Laura Kostyra Plimpton, passed away today in Norwalk Hospital," Stewart, 73, posted.
Although Plimpton was rushed to the hospital after falling ill, doctors could not save her, Stewart's message said, going into further detail as follows:
"She woke up Monday morning at 5:30 a.m., did her elliptical and treadmill, then showered and felt ill enough to call her husband, Randy, for help."
"Laura left a living will so she was kept on life support until today so her three children could say their goodbyes, and the testing could be completed for organ donation."
Following her first husband's death, Plimpton went to work for her sister. More than 25 years later, she still ran daily operations at Martha Stewart Living Omnimedia.