Lady Lucan, whose husband famously vanished more than four decades ago, has been found dead at her home in London.
Police forced entry to the 80-year-old's home in Westminster on Tuesday after she was reported missing, and found her unresponsive inside - writes itv.com.
A spokesman for the Metropolitan Police said: "Police attended an address on Eaton Row in Westminster ... following concerns for the welfare of an elderly occupant.
"Officers forced entry and found an 80-year-old woman unresponsive.
"Although we await formal identification we are confident that the deceased is Lady Lucan."
Police say her death is being treated as unexplained but is not believed to be suspicious.
Her son George Bingham, the 8th Earl Lucan, told the Daily Mail: "She passed away yesterday at home, alone and apparently peacefully.
"Police were alerted by a companion to a three-day absence and made entry today."
Lady Lucan was one of the last people to see her husband John Bingham, the 7th Earl of Lucan, alive before he disappeared.
He vanished after the body of Sandra Rivett, nanny to his three children, was found at the family home in central London, on November 7 1974.
Lord Lucan was officially declared dead by the High Court in 1999.
However he has reportedly been sighted in Australia, Ireland, South Africa and New Zealand, and there are even claims that he fled to India and lived life as a hippy called "Jungly Barry".
The same night as his disappearance, the attacker also turned on Lady Lucan, beating her severely before she managed to escape and raise the alarm at a nearby pub.
Lucan's car was later found abandoned and soaked in blood in Newhaven, East Sussex, and an inquest jury declared the wealthy peer the killer a year later.
Earlier this year, Lady Lucan, formally named Veronica, Dowager Countess of Lucan, gave a television interview to ITV in which she said she believed Lord Lucan had made the "brave" decision to take his own life.
Ahead of the hour-long documentary interview called Lord Lucan: My Husband, The Truth, Radio Times magazine shared some of her words with director Michael Waldman.
She said: "I would say he got on the ferry and jumped off in the middle of the Channel in the way of the propellers so that his remains wouldn't be found - I think quite brave."
During the ITV programme she spoke of her own depression and her husband's violent nature following their marriage in 1963.
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