Scotland Yard has reopened an investigation into the 1997 death of a woman after links to the British couple accused of keeping slaves were revealed.
At the time of her death, the woman was living with Aravindan and Chanda Balakrishnan, this week arrested for allegedly keeping three women as slaves for 30 years.
The original inquest reached no conclusions on how the woman died.
The BBC have also spoken to Charlotte Watts, a former neighbour of the Balakrishnans who lived two doors down from the family for a decade.
She regularly saw the three women in the neighbourhood.
"They appeared quite vulnerable; they didn't have any social skills whatsoever and they used to walk in a line…they never made any eye contact."
Ms Watts noticed one woman in particular, who often stood in an upstairs window.
"She used to stand in that window for hours, just staring, but for a long period of time. I used to wave at her and not get anything back," she said.
The woman wrote notes and held them in front of her, but the distance between the window and the footpath was too great for comprehension, Ms Watts said.
"I could never read what they were saying."
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