Katherine "Kathy" Costello Wainright (née Nightingale) was the sister of Larry Nightingale and a friend of Sally Sparrow. She was born no later than 1988.

In 2007, she visited Wester Drumlins with Sally to investigate the premises. There she was sent back in time to Hull on 5 December 1920 by a Weeping Angel after being distracted by a mysterious man trying to give Sally a letter. Stranded, she started a new life, married Ben Wainwright and they had two sons and a daughter, also named Sally.

In 1969, the Tenth Doctor, working from information given to him by Sally Sparrow, contacted Kathy and enlisted her aid in sending a message to Sally in 2007, although it was another eighteen years before she did so.

She died in 1987, shortly after writing a letter that her grandson, Malcolm Wainright, delivered to Sally Sparrow in 2007. Unlike Billy Shipton who, in order to fulfil his instructions, had to be given the date of his death, it appeared that Kathy wasn't given this information, as her letter suggested the possibility that she might still be alive for a time after writing the letter.

An elderly Kathy with her grandchildren. (TV: Blink)

Viewing Kathy's tombstone in 2007, Sally saw that the birthdate on it would have made Kathy eighteen in 1920. This led Sally to jokingly call her friend a "lying cow", indicating that Kathy lied about her age when she reestablished her life in the 1920s.

The Weeping Angel consumed the potential energy from the time Kathy Nightingale would have spent in the present. (TV: Blink)

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