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By Alexander Smith

Fans remembered Prince overnight with purple tributes, dance parties and tweets following the pop maestro's sudden death at 57.

The Grammy-winning artist was discovered slumped in an elevator at his estate in Chanhassen, Minnesota, and pronounced dead at the scene at 10:07 a.m. (11:07 a.m. ET) on Thursday. The Midwest Medical Examiner's Office conducted an autopsy Friday.

Photo Gallery: Prince Fans Pay Tribute to the Music Icon

Buildings across the U.S. — including Minneapolis’ Lowry Ave. Bridge and San Francisco City Hall — were illuminated purple in tribute to the star’s hit “Purple Rain.”

The Niagara Falls were also lit up the same color, although this was to mark Britain’s Queen Elizabeth II’s 90th birthday Thursday and nothing to do with Prince.

The cast of Broadway hit "Hamilton" honored the singer by dancing to the 1984 hit "Let's Go Crazy" after Thursday night's show.

Elsewhere on Broadway, the cast of "The Color Purple" ended their show by singing "Purple Rain."

Celebrity fans from Barack Obama to Whoopi Goldberg also lined up to pay tribute.

A week ago, Prince's plane made an emergency landing in Illinois and Prince was hospitalized with what he described as flu. That illness followed him cancelling a pair of concerts in Atlanta.

He did perform in the city on April 14, joking with the crowd about being "under the weather" while giving a slight smile, according to The Associated Press.

His voice seemed a bit weak at times when he spoke, but he sounded fine when singing during his 80-minute show, which included everything from songs made famous by others ("Nothing Compares 2 U") to his finale to the first show of the evening, "Baby, I'm A Star."

The singer sat at his piano most of the show, but stood up at times to pound the keys and walked around the piano a couple of times, soaking up cheers.

Following reports that he had been sick, Prince tried to allay concerns about his health by announcing a dance party Saturday night at Paisley Park, where he briefly appeared, according to the Minneapolis Star Tribune.

Minneapolis resident Lars Larson told the AP he was at the same dance party.

"He seemed great. He looked like Prince," a 37-year-old said. "The whole point of the show on Saturday was to show he was doing all right."

Related: Prince Recovering After Plane Makes Emergency Landing

Born Prince Rogers Nelson in Minneapolis in June 1958, his death is the latest in what appears to be a slew of celebrity bereavements in 2016.

Like David Bowie, Merle Haggard, Phife Dawg and others in the months before him, Prince was immediately the subject of a flood of tributes, both on and offline.

Associated Press contributed.