Vladimir Kramnik attends an event in St. Petersburg, Russia, in 2019. Iliya Pitalev/Sputnik via AP/FILE

Former world chess champion Vladimir Kramnik is being investigated for bullying and harassment following the death of fellow player Daniel Naroditsky , world chess governing body FIDE has announced .

Naroditsky, an American chess grandmaster who amassed a large online following through streaming and teaching, died unexpectedly at the age of 29, according to a statement released by his family via the Charlotte Chess Center on Monday. No cause of death was announced.

Kramnik, a grandmaster and the world chess champion between 2000 and 2007, had repeatedly accused Naroditsky of cheating in online games.

Daniel Naroditsky is seen playing chess in a photo released by Charlotte Che

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