Fatman Scoop, who topped charts in Europe with Be Faithful two decades ago and later contributed to hits by other artists, has died after collapsing on stage at a show, according to officials and his family.
The rapper died while performing at Hamden Town Center Park in Connecticut on Friday, aged 53.
The cause of his death was not immediately clear.
Mayor of Hamden Lauren Garrett posted on Facebook that Scoop had a medical emergency.
Concertgoers and paramedics tried to aid the artist, who was taken to a hospital, she wrote.
His family wrote in an Instagram post on Saturday that "the world lost a radiant soul, a beacon on stage and in life".
If the world knew him as an artist who got club-goers moving, his family cherished him as "the laughter in our lives, a constant source of support, unwavering strength and courage", his relatives wrote.
"His music made us dance and embrace life with positivity. His joy was infectious and the generosity he extended to all will be deeply missed but never forgotten."
Fatman Scoop, born Isaac Freeman III, was from New York City's Harlem neighbourhood and broke out with Be Faithful in 1999.
What started as a minor success in the US took off in Europe with a 2003 re-release, hitting number 1 on the singles charts in the UK and Ireland.
But Scoop, sometimes stylised as Fat Man Scoop or FatMan Scoop, was perhaps best known for his feature role on Missy Elliott's Lose Control, a 2005 song of the summer that also featured Ciara.
The track won a short-form music video Grammy at the 2006 award show.
The same year as Lose Control, he was featured on Mariah Carey's It's Like That.
He also was featured on tracks from Timbaland, David Guetta, The Situation and Skrillex, among other artists.
In 2018, he reunited with Elliott and Ciara for a remix of the latter's Level Up.
Elliott praised Scoop's "voice and energy" in a post to X on Saturday, saying he had contributed to many songs that made people happy over more than two decades.
"Your IMPACT is HUGE & will be NEVER be forgotten," she added.
His longtime booking agency, MN2S, described him as an artist with "boundless enthusiasm", a passion for music and a voice and personality that "made an indelible mark on the industry".
His MN2S representative, Sharron Elkabas, said in a statement that she had spoken to him a few days earlier.
"He was in such good spirits. It's hard to believe he is no longer with us."
AP