"You've given so much. And I wish I could be there. I wish I could be of some use to you," singer tells O'Connor
Singer addressed mental illness battle in clip posted last week
From Nirvana to Queen, we rank the 25 greatest musical performances in the history of 'Saturday Night Live'
Singer apologizes for accusing comedian of providing late musician narcotics
Singer's latest Facebook missive clarifies suicide rumors, hopes for independent Ireland after Britain leaves EU
Win Butler, Régine Chassagne spin David Bowie, Sinéad O'Connor during exhibition by French street artist JR
The Irish singer was reported "missing suicidal" by Wilmette police earlier today
"I'm also very happy to notice that the DEA have taken me seriously enough to be thoroughly questioning all of Prince's friends," singer says
Singer previously claimed talk show host was Prince's drug dealer, spiked her marijuana
"I have taken an overdose. There is no other way to get respect," singer writes
The singer also targeted Miley Cyrus, Lady Gaga and Prince in new interview
Soul legend takes on Etta James, Alicia Keys and the Supremes on upcoming album
The veteran singer gets inspired by Beyoncé, Lean In movement
Incident happened days after she tore up a photo of the Pope on 'SNL'