David Jolicoeur of De La Soul, the rap trio that expanded the stylistic vocabulary of hip-hop in the late 1980s and early ’90s with eclectic samples and offbeat humor, becoming MTV staples and cult heroes of the genre, died on Sunday. He was 54.

His death was confirmed by the group’s publicist, Tony Ferguson, who did not specify a cause or say where Mr. Jolicoeur was when he died. In recent years, Mr. Jolicoeur has openly discussed a struggle with congestive heart failure, including in a music video for the group’s song “Royalty Capes.”

De La Soul arrived with the album “3 Feet High and Rising” in 1989, a time when hip-hop was still relatively new to the mainstream. The genre’s public face was often confrontational, with groups like Public Enemy and N.W.A speaking out about the racism, police violence and neglect faced by Black communities in America.

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