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Prince Rogers Nelson, one of the most successful musical artists of all time, has died aged 57, according to the Associated Press.

Known by his mononym Prince, the Purple Rain singer died at his Paisley Park studio in Minnesota, the state where he was born and raised, according to the AP.

The singer was briefly hospitalized in Illinois last week for a flu emergency, according to TMZ. He cancelled two shows in Atlanta because of the illness.

Police said on Thursday morning that they were investigating a death at Prince’s estate, but would not confirm the deceased’s identity until the next of kin had been notified.

Prince wrote hundreds of songs for himself and other artists and released 39 studio albums including four in the last 18 months.

Last month, publisher Spiegel & Grau announced that it acquired Prince’s memoir, set for release in fall of 2017. “We’re starting from the beginning from my first memory and hopefully we can

go all the way up to the Super Bowl,” Prince said.