Christopher ‘Big Black’ Boykin, one of the stars of MTV’s hit series, Rob & Big, has died suddenly. He was 45.

Boykin starred alongside Rob Dyrdek in the popular MTV show which ran from 2006 to 2008.

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His rep tells us Christopher died Tuesday morning. No official cause of death yet, but multiple people connected to Chris tell us they believe it was a heart attack. He was Rob’s best friend and bodyguard on their reality show — and also later appeared on ‘Fantasy Factory.’ h/t tmz

Our thoughts and prayers go out to Boykin’s family and friends at this difficult time.