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Despite Miley Cyrus' attempt to turn her feud with Sinead O'Connor private, the "Nothing Compares 2 U" singer has written a fourth lengthy screed against Cyrus on her website following the Bangerz star's Today show appearance. 

In it, O'Connor continues to blast Cyrus for mocking mental illness, which was also the message of her second and third open letters. "You’ve said on Matt Lauer’s show that you don’t understand why I have been upset with you," O'Connor wrote. "Until you exposed me to abuse on the grounds of my having sought help (extremely coherently) to save my life [two years ago] when experiencing suicidal compulsion as a side effect of a medication called Tegretol, I had no problem with you whatsoever."

The Irish singer goes on to say that Cyrus' posting of a two-year old Twitter rant O'Connor has since deleted has caused her a great deal of professional stress, as many people in the industry are now under the impression she's once again struggling with mental illness. "I now have to have [my] management write to the show business world to explain my tweets were two years old and that in fact I am very fit for work," O'Connor said. "No person, myself included, should wake to the types of e mails and communications I have had for the last few days urging that I should kill myself, nor to the type of 'net abuse' I have had to endure as a result of what you did."

As recompense Sinead wants Miley to apologize "unconditionally and withdraw your remarks." And despite continuing to air her grievances for all the world to see, O'Connor wrote she had "no interest in the 'feud' which media want." 

Claiming her responsiblites as a mother prevent her from contacting Miley more privately, the singer goes on to say, "There is no 'feud' as far as I am concerned. What there is, however, is a lot of very serious harm caused to myself and my children… and DEFINATELY [sic] to silent sufferers of [mental illness who are] your own age who may look up to you."

Hopefully they can resolve this surprisingly toxic "non feud" before a fifth open letter comes out.