Sian Davies died at Maoist slave couple Aravindan and Chanda Balakrishnan's home The youngest of the three women held as 'slaves' in London bombarded a male neighbour with love letters. Death in 1977 at Maoist couple's home being investigated ... Sian Davies died after falling from a second-story bathroom window at a housed leased by Aravindan Balakrishnan and his wife Chanda. Picture: ITV screen grab Source: Supplied THE London slave scandal that has made headlines worldwide has taken a dramatic new twist, with police investigating the death of a woman at a home "controlled" by the couple at the centre of the investigation. And it has been speculated that she was the mother of a woman held for three decades by the couple. Sian Davies, aged 44, fell two stories from a bathroom window of a house previously leased by Maoist cult followers Aravindan Balakrishnan and his wife Chanda, who have been charged over keeping slaves in their home for up to 30 years. The Times reported that Davies, said to be part of a group called "The Collective, was left paraplegic in the fall on December 24, 1996. She died in King's College Hospital in London in August 1997. It is not known whether Davies was a visitor or lived at the home in Herne Hill, London with Balakrishnan and his wife. The Sun has reported she is believed to have been the mother of the lifelong slave named as Rosie, who was recently released along with two other women apparently kept by the Balakrishnans at another home in Lambeth. Until now it had been reported that Rosie's parents died in a fire. Davies, a former student, had lost touch with her family after joining The Collective and had been with the group, controlled by Balakrishnan, known as Comrade Bala, for over 20 years. Davies' cousin Elery Morgan told ITV News that her family had been furious that they were not informed of her injuries before she died. Members of "The Collective" were questioned at the inquest. Aishah Wahab, one of the group's members, said that she had followed Davies upstairs that day and had heard the window opening and a scream. Wahab told the inquest that the window was opened for ventilation. Corner Selena Lynch called the death a "mystery." "I still find it difficult to know how she fell out of the window, indeed what she was doing opening the window at that cold time of year," she said. A neighbour of the property in Herne Hill, London, said there were rumours of a strange sect living in the house during the Balakrishnans' seven-year tenancy in the 90s. "I remember was there was local gossip that a woman had fallen out of a window and that she had died," Kate Roncoroni, 43, told The Mirror. People were talking about it having something to do with a cult. It was a very different area in those days. There were squatters and bonfires in the streets. You wouldn't think much about groups living together then. A Scotland Yard police spokesman told The Mirror: "We are aware of this and we are attempting to access archived paper records from the inquest." A total of 13 addresses linked to the suspects, who set up the Communist cult in the 70s, are being investigated. Balakrishnan, 73, and his wife Chanda, 67, were arrested last week on suspicion of keeping three women in domestic servitude for three decades, refusing them permission to leave and administering physical beatings. Read more about their bizarre existence here. Police suspect the two of the women may have begun living with the couple shortly after the political cult was closed down. They believe they never left because they had been brainwashed and were genuinely terrified, while Rosie was borne into captivity. This fear was borne out in some of the 500 letters in seven years the 30-year-old wrote to a neighbour in Brixton in which she described feeling like "a fly trapped in a spider's web." The three victims are believed to include Aishah Mautum, 69. She lost contact with her family in Malaysia after arriving in the UK with her husband and becoming tied to a Maoist group; a 57-year-old Irish woman believed to be from County Armagh, and British woman Rosie, who is thought to have been born into captivity. All three were "rescued" with the help of police and a small charity last month. "Unspeakable torment" ... the 30-year-old slave Rosie held as a slave in a house in London. Balakrishnan and Chanda were well known to police and security authorities in the mid 1970s after setting up an extreme left wing squat in a bookshop called the Mao Zedong Memorial Centre in Brixton. Balakrishnan was a former member of the national executive committee of the Communist party of England (Marxist-Leninist) but was suspended from the party in 1974 for pursuing "conspiratorial and splittist activities." The pair was arrested in 1978 when police stormed the bookshop to shut it down and both later served a prison sentence for assaulting an officer during the raid. Between them they were jailed eight times during the 1970s but then laid low. "They were a tiny, very tight-knit group clearly under the spell of their leader 'Comrade' Balakrishnan," said Professor Steve Rayner, an Oxford University academic who researched the extremist Maoist group at the time. Rosie penned hundreds of desperate letters and poems from captivity to a neighbour, describing how she suffered "unspeakable torment" at the hands of a couple who adopted her when she was a baby after her parents died in a fire. Hundreds of letters and poems of torment ... One of Rosie's letters. The unit at Peckford Place, Lambeth, where the family group lived was boarded up last night. Balakrishnan and his wife Chanda have been given police bail until January as investigations continue. The house of "slaves" ... A man walks near a road sign in Lambeth in London where three women were allegedly been held in a house for 30 years as slaves. (Photo by Peter Macdiarmid/Getty Images) Source: Getty Images