The woman who inspired The Beatles ' song Dear Prudence was Robert Durst 's mistress until days before his wife went missing . Prudence Farrow , sister to Mia , had her name etched into cultural history at the age of 19 when she inspired John Lennon to write her a song at an Indian ashram . But lesser-known is her affair with the alleged killer Durst who was arrested this month and charged with the 2000 murder of his friend , Susan Berman . Durst , 71 , was sensationally acquitted of the 2001 murder of neighbor Morris Black and has long been suspected of killing his first wife , Kathie , and then murdering long-time friend Susan Berman . According to the New York Post , Farrow and her husband Albert Bruns , to whom she remains married , were living in a New York City property owned by Robert Durst . Scroll down for video . Prudence Farrow ( far left ) was 19 when she attended the same Indian ashram as The Beatles and was so immersed in her meditation tent that John Lennon sang a song to her - which became Dear Prudence . A decade later she was widely known to be Robert Durst 's mistress . The alleged killer ( pictured ) was arrested on March 14 and charged with murder after a docu-series about his life screened on HBO . They married in the late 1960s but from 1980 to 1982 , Farrow kept up a widely talked-about affair with Durst , according to a number of reports . At one point , the Post notes , a 34-year-old Farrow called his with Kathie in an attempt to convince her to file for divorce . It was a dark chapter more than a decade after she attended the same meditation retreat as John , George , Paul and Ringo , where she became an inspiration . In an attempt to reach enlightenment , Farrow refused to come out of her meditation tent . Eventually , the story goes , John Lennon went over and sang the first semblance of Dear Prudence - 'wo n't you come out to play ' . The ditty became the second track on the band 's acclaimed White Album . Robert Durst and his first wife , Kathleen , who went missing in 1982 . She has never been found . Farrow allegedly called Kathleen two months prior to her disappearance asking her to leave Durst . Durst was acquitted of murder in 2001 . He is now on suicide watch as he awaits trial in Louisiana . Farrow , whose mother Maureen O'Sullivan was Jane in Tarzan , later recalled how deeply immersed she was in the ashram . But she refuses to touch on the allegations surrounding Durst . He was arrested in New Orleans on March 14 a day before the final episode of the HBO documentary The Jinx : The Life and Deaths of Robert Durst , in which he was shockingly caught on tape saying ' I killed them all , ' at the end . Police believe he was preparing to flee the country as he was found in a hotel room with a latex mask , false ID , a loaded Smith & Wesson .38 caliber revolver with one spent shell casing and $ 42,000 in cash . A small amount of marijuana was also discovered . He is now on suicide watch as he awaits trial in Louisiana on gun and drug possession charges and extradition to California to face a murder trial in the Berman case . Farrow is now a meditation teacher and author .
Prudence Farrow was 19 when she was at an Indian ashram with Beatles . She would n't come out of her tent so John Lennon wrote Dear Prudence . A decade later she was Robert Durst 's girlfriend in New York City . Though she was married , she allegedly tried to persuade his wife to sue for divorce and let them be together . Robert Durst , 71 , was sensationally arrested this month , a day before the end of an HBO docu - series about his rape allegations .