WILMETTE, Ill -- Singer-songwriter Sinead O'Connor has been reported missing in the northern suburbs of Chicago. O'Connor, who is most popular for the 1990 release, "Nothing Compares To You" that was written by Prince, went out on a bicycle ride at about 6 a.m. in Wilmette Sunday and has not been seen since. What she was doing in Wilmette has not been determined. Wilmette police say they have no comment at this time, but TMZ says they continue to search for her and an alert has listed her as "missing suicidal." She was last seen on a Raleigh motorized bicycle with a pink basket wearing a black parka, black leather pants and a sweatshirt with "Ireland" on the back. She had gotten medical treatment back in November after leaving an angry suicidal note for her family. O'Connor was recently in the news for being sued by comedian Arsenio Hall for making statements after Prince's death that Hall supplied Prince with drugs. This is a developing story. Check back for details.