Lord Lucan's son, George Bingham, has spoken for the first time about that fateful night the family's nanny was brutally murdered.
Back in 1974, aristocrat Lucan disappeared after Sandra Rivett was found dead in the family home, murdered with a piece of bandaged lead piping.
Lucan's wife Veronica, with whom he was going through an acrimonious divorce, was checked into hospital after also being attacked in the basement of the London residence.
Sandra Rivett, nanny to Lord Lucan's children, was found dead in Belgravia, London, in November 1974
The police named Lucan as the prime suspect, but were unable to locate him, instead only finding a blood-stained car he was seen driving, abandoned at Newhaven, east Sussex.
A coroner, in the absence of the prime suspect, declared in 1975 that Lucan had indeed killed the pretty nanny.
'What I am certain of is Dad was NOT the prime mover in the situation,' Lucan's son told the Daily Mirror.
'Weirdly, however, I do hope he was partly culpable because it makes me feel better.'
Bingham believes that his father would not have absconded, leaving his children (which included sisters Camilla and Frances) behind without real reason.
And that's why he hopes his father did have some part to play in that tragic night's events'
'I would rather that than have my father leaving us for no apparent reason – meeting a horrible end, cold and alone, out of some misplaced sense of honour or pride that made him kill himself even if he hadn’t been involved,' he went on to tell the Daily Mirror.
The graphic nature of the killing and in particular the amount of blood that was found at the scene, leads Bingham to suspect that one or more parties were involved in the murder, yet he does not entirely discount his father being one of them.
He does, however, disagree with the version of events according to his mother, with whom he no longer has contact with, believing that the state of her relationship with Lucan at the time clouded her details of fact.
Lucan left two letters behind addressed to his brother in law William Shand Kydd, written on the night of the murder.
In these letters the tone is clear that he was not to return, giving details of his banking details and estate.
The second letter, in particular, is most interesting.
In it, he refers to a 'fight' he broke up at the property, and that a man left following the assaults.
However, speaking with a worry for the welfare for his children, Lucan appears adamant that 'V' (Veronica) would make things difficult for him, and that he couldn't face being charged with attempted murder.
Bingham hopes his no-hold-barred account of that horror night can put to bed many rumours that came out at the time, and are still prevalent today.
Some say Lucan mistakenly killed Rivett instead of his wife, as the lighting was poor in the house at the time.
Others say he hired a hitman to do his dirty work, and then escaped to Kenya with the help of some of his high-powered friends.
An assistant of zoo owner John Aspinall revealed this year that she booked flights for Lucan's children in 1979 and 1980 to visit a reserve in Kenya - but in reality it was for Lucan to see how his children had grown up.
'I know in my own mind what happened to my father. I also know, after thinking about it long and hard, that now is the right time to tell everyone exactly what happened on that horrible night, the night he vanished forever,' added Bingham.
The children lived with their mother until 1982 until all custody was transferred to their aunt and uncle, Lucan's sister Christina and her husband William Shand Kydd, the recipient of Lucan's letters.
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