Pictures of Prince looking frail one month before his death have appeared online.
The 57-year-old singer was found dead at his home in Minneapolis, Minnesota, on April 21.
The photos of Prince looking frail and holding a cane were reportedly taken on March 21 as he made his way from his private jet in Montreal, Canada, ahead of two concerts in the city, the Daily Express reports.
News of the singer’s death broke after officers responded to an emergency call at 9:43 a.m. from his Paisley Park home, according to CBC.
When deputies arrived, they found Prince unresponsive in the elevator, Carver County Sheriff Jim Olson said.
Medical workers attempted CPR but were unable to revive him. He was pronounced dead at 10:07 a.m.
Just six days earlier, on April 15, his jet was forced to make an unplanned stop in Illinois after the 57-year-old suffered a medical emergency onboard.
A spokesperson said afterwards Prince was feeling much better and was resting at home.
"Never one to conform, he redefined and forever changed our musical landscape," Neil Portnow, president of The Recording Academy, said in a statement, CBC reported. "Prince was an original who influence so many, and his legacy will live on forever."
Prince released his first studio album, "For You," in 1978, and made a name for himself internationally with hits like Purple Rain, Kiss, Little Red Corvette and Raspberry Beret.
After the 1980s, two of his most famous recent performances came in 2004, when he appeared alongside Beyonce at the Grammies, and in 2007, when he performed what has been described as one of the best Super Bowl halftime shows.
Throughout his career, he wrote songs for other artists and mentored musicians. Prince’s autobiography had been due for publication in 2017.
He was hailed as a trailblazer when he was inducted into the Rock and Roll Hall of Fame in 2004, Daily Express reported.
In total, Prince won seven Grammies, an Oscar for the score in the movie "Purple Rain," and a Golden Globe for the title song of the 2006 movie "Happy Feet."
He fought a battle with Warner Bros. over the rights to his music which led to him performing as The Artist Formerly Known as Prince for some time. In 2014, an agreement was signed giving Prince the rights to his master recordings.
Later in his career, he became a critic of digital downloads.
"Tell me a musician who’s got rich off digital sales,” he said in November 2015. " ... Apple's doing pretty good though, right?"
Prince's autopsy is scheduled for April 22.