Dmitri Hvorostovsky, the charismatic Siberian baritone who won critical acclaim and devoted fans around the world for his burnished voice, uncanny breath control and rueful expressivity, died on Wednesday in London. He was 55.

Mark Hildrew of Askonas Holt, the talent management agency that represented Mr. Hvorostovsky, said the cause was brain cancer. Mr. Hvorostovsky announced the diagnosis in June 2015 and died in a hospice facility near his London home.

A favorite of audiences thanks to his alluring voice and heartthrob presence, Mr. Hvorostovsky cut a striking figure, his trim 6-foot-1 frame topped by a mane of prematurely white hair.

He also had a compelling personal story: He escaped the street-gang life as a teenager in a grim Siberian city, found his talent there despite the region’s cultural isolation, and overcame a tempestuous drinking problem that could have ruined his career.

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