Rob & Big Star Christopher ‘Big Black’ Boykin Dead at 45

Christopher ‘Big Black’ Boykin, who was the other half of Rob Dyrdek‘s hit MTV show “Rob & Big” — has died …

His rep tells TMZ Chris 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, which ran from 2006 to 2008 — and also later appeared on ‘Fantasy Factory.’

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