Sinead O'Connor has gone missing while out and about in Chicago, police have confirmed.
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The controversial singer was last seen at 6 a.m. on Sunday when she went for a bike ride in Wilmette, a suburb of Chicago.
Police Sgt. Michael Robinson sent out a bulletin for a "check-for-well being" alert after a called, who is unidentified, called authorities after O'Connor didn't return.
According to reports, it wasn't unusual for the singer to take bike rides. However, it is worrisome because, according to TMZ, the Irish singer is classified as a "missing suicidal."
Just ahead of her disappearance, O'Connor penned a note on Facebook to her son Jake Reynolds, who is 28. The two are in a custody battle over 12-year-old son Shane.
"Do not abandon your brother or any other of my babies again," she charged. "What you have done to your brother and your mother is LITERALLY criminal."
Over the weekend, she also directly addressed Shane, telling him to question his custody and noting that she has been trying to see him. "I have to back off because they are hurting me so badly I get unwell again if I go near them," O'Connor wrote.
However, she also addressed fans and said that she was going to be "heading down South" to North Carolina for a few weeks.
O'Connor has had several alleged brushes with suicide before. Just last year she wrote on Facebook that she'd "taken an overdose' after her family treated her with "appalling cruelty."
At that time, she said that her depression was over the fact that her exes weren't allowing her to see her son and that she was "being treated so badly" by her family.
O'Connor is currently in a legal battle with Arsenio Hall after he filed a libel lawsuit against her for saying that he was Prince's drug dealer and the person that led to his death.
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According to court documents, Hall is "Hall is seeking "not less than $5 million" in damages. In response to the suit, O'Connor said, "I'm more amused than I've ever dreamed a person could be and look forward very much to how hilarious it will be watching him trying to prove me wrong."