RIP
Christopher 'Big Black' Boykin, who was the other half of Rob Dyrdek's hit MTV show "Rob & Big" -- has died ... TMZ has learned.
His rep tells us 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.'
Rob & Big Star Christopher 'Big Black' Boykin Dead at 45 | TMZ.com