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David Walker was an 20th century Earth human.
When Molly O'Sullivan left with the Eighth Doctor in 1918, she gave David Walker the keys to 107 Baker Street. (AUDIO: The White Room) David lived in the house until the 1970s. In the interim, he married a woman named Isabelle and they raised their two sons, one of whom was named Nigel, in the house. (AUDIO: Eyes of the Master)
