Three months after walking off the field in the middle of a game, Campbell went on a social media rant about it.

It's the question every NFL fan had back in December when San Francisco 49ers linebacker De'Vondre Campbell refused to come into a loss to the Los Angeles Rams: why did he quit on his team, something

De'Vondre Campbell breaks his silence, doubling-down on his refusal to enter the 49ers' Week 15 game against the Rams.