Rory Williams was a patient at Grey Sloan Memorial Hospital.
History
Family History of Cancer
Her family has a history of repeated cancer, which manifested in her. By age sixteen, she'd had three different types of cancer.
Cancer Diagnoses
Rory had brain cancer at age ten which was fully cured. However, when Rory was sixteen, she was diagnosed with osteosarcoma and was also discovered to have a tumor in her chest.
Li-Fraumeni
Rory having three cancers by age sixteen and the family history of prominent cancer diagnoses prompted Miranda Bailey to look for a genetic reason. She discovered a mutation of the P53 gene and concluded that the family carried Li-Fraumeni Syndrome, which affects their bodies' ability to regulate cell growth.
Death
Rory became unresponsive and wasn't breathing properly, so she was rushed into surgery. Despite the doctors' best efforts, Rory bled out into her chest and died. When the doctors came to tell the Williams family, they were distraught and it prompted Ariel to ask the doctors if she also had Li-Fraumeni, which she did.
Relationships
Familial
Ariel Williams
Rory got along well with her sister, Ariel. Ariel was with her when she became unresponsive, prompting the surgery in which she died. After her death, her sister said she'd always wanted to be like her.