Lord Lucan went on the run and is now presumed dead after he seemingly killed the family nanny, Sandra Rivett, in the family home all of those years ago.
In an incredibly rare interview, his widow has now spoken out about exactly what happened that night, with her going into detail about the moment that she thought he was also going to kill her before she managed to flee.
She said that the evening started off fairly normal, with her 10-year-old daughter Frances – who she no longer speaks to along with her other two children – going upstairs to watch television, before Sandra asked her if she wanted a cup of tea.
Lady Lucan – who was interviewed in her mews house – then explained that she eventually went on the hunt for her when she realised that she was taking an abnormally long time.
ITV • GETTY
Lady Lucan has spoken out about her husband in a rare interview
Countess recalled the night of her nanny's murder
I thought he would put a pillow over my head and smother me
She shared: “I saw the basement was dark and I thought ‘that’s strange she can’t be there.’ I [then] heard movement of something or someone coming from the cloak room and someone hit me on the head four times. I screamed and my husband put three gloved fingers down my throat.
“He started to strangle me and then tried to poke my eye out, but I continued fighting and grasped at his genitals. He moved back and I found myself sitting in between his legs. I just sat there and said to him ‘please don’t kill me John’. I said ‘where’s Sandra?’ and he said ‘she’s dead, don’t look.’
“He said ‘Sandra has few friends, no-one will miss her.’ He [then] said ‘have you got any sleeping tablets?’ and I said ‘yes I have’ and he hustled me up the stairs.”
Lady Lucan went on to say that she feared for her life, especially when she saw her bloodied reflection in the mirror.
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Lady Lucan said she thinks her husband has committed suicide
Lord Lucan has been missing since 1974
She continued: “I was concentrating with all my mind on how to survive the situation I was in. We went into the en suite bathroom and stood there in front of the mirror, my face was absolutely covered in blood and it was impossible to see how much damage had been done because there was so much blood.
“Presumably he was hoping the I was going to go to sleep and I thought he would put a pillow over my head and smother me. He then went back into the bathroom and I heard the taps running, so I ran as fast as I could out of the front door.
“He thought I was going to be there to help him and I can imagine the horror when he realised that I had gone.”
Lady Lucan is now convinced that her husband has committed suicide, despite multiple theories and alleged sightings doing the rounds online over the years.
Lord Lucan: My Husband, The Truth airs on ITV tonight at 9pm.