24-year-old identical twin dies 1 month after being given ‘6 months to live’ amid terminal diagnosis

June 25, 2026 by bilal

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Grace and Caitlin were not only sisters, but also best friends. As reported by the BBC, they had always been cose and even lived together at university. It wasn’t until after Caitlin’s diagnosis they discovered they were identical twins.

For years, everyone believed Caitlin and Grace were fraternal twins because they had developed in separate amniotic sacs. But when doctors began evaluating Grace as a potential stem cell donor for her sister, they made a stunning discovery, the BBC wrote.

Identical twin Caitlin Leggett died 1 month after given ‘6 months to live’

Tests revealed that the twins shared exactly the same genetic markers – meaning they were, in fact, identical twins. While it came as a surprise, it also was heartbreaking news. Because of their nearly identical DNA, Grace was no longer able to donate her stem cells to help save her sister.