There were no obvious signs.
In the months before his death Thursday at 57, Prince was active, onstage and off. In concert at his Paisley Park complex in Chanhassen, he jumped atop his grand piano and carried on with abandon. He was seen attending basketball games and concerts by the likes of Madonna, strutting with his usual purple attitude.
But in retrospect, those who saw him regularly say there were indications that the always-mysterious Minnesotan might have been concealing health problems. He abandoned his trademark high-heeled boots for custom platform sneakers, for one thing, and began carrying a cane.
The mystery deepened after Prince canceled a pair of concerts April 7 in Atlanta, blaming the flu. He finally played those dates a week later, but his plane made an emergency landing in Moline, Ill., on the return flight.
A Prince associate said he was suffering from extreme dehydration. However, celebrity news website TMZ, citing unidentified sources, reported that he was treated for an overdose of Percocet, a painkiller that contains acetaminophen and the opioid oxycodone.
When he held court at Paisley a day later in an attempt to quell rumors about his health, "he looked pasty, weak and frail," said longtime fan Nancy Andersen of Minneapolis. "I didn't attribute it to anything other than he'd had the flu. He did have trouble walking up the steps to the piano."
While he never confirmed it, rumors had swirled for some time that Prince had a hip operation several years ago — part of the physical toll exacted by his decades as one of rock's most electrifying live performers.
"There was always something kind of bothering him, as it does all of us," former bandmate Sheila E told the Associated Press. "We know all the years of him jumping off the risers and the speakers onstage in the heels, you know, messed up his hip and his knee, but he kept doing it because he loved doing it and it was something no one was doing."