Deborah resided in 11th-century Scotland as Colin MacLeod’s wife. When Colin revived after dying in an attack—revealing his immortality—his clan condemned him as demon-possessed. Deborah shielded him physically, declaring threats to Colin must pass through her first. Her defiance stalled violence until clan leader Gregor MacLeod intervened, securing Colin’s exile over execution.

In an alternate timeline reflecting her core identity, Deborah (called Moya) lived as Colin’s wife in 2nd-century Roman Britain. During a Roman assault led by the immortal Marcus Octavius, Marcus captured and crucified her, causing her death. This execution fueled Colin’s eternal hunt for vengeance against Marcus.

Her legacy echoed across eras. Centuries later, her essence seemingly reincarnated in Dahlia, a resistance fighter in post-apocalyptic New York. Colin recognized Deborah in Dahlia through identical mannerisms and deathbed words, affirming her enduring impact. Deborah’s unresolved death forged Colin’s identity as an immortal fixated on vengeance until his ultimate redemption.