Whatever happened to Screech? Diamond, who played the gang's silly sidekick, is no longer close with his cast mates – and didn't take part in PEOPLE's shoot. Since Bell, the comedian has appeared on Celebrity Fit Club and starred in a porn video leaked onto the internet in 2006. He then dished the dirt on his former costars in a 2009 tell-all called Behind the Bell. "It's no holds barred," he said.