Jesse Williams will not be silenced.

The Grey's Anatomy star sent a series of tweets Wednesday about the shooting of Alton Sterling, a 37-year-old black man who was fatally shot by police officers shortly after midnight Wednesday in Baton Rouge, La. The killing sparked protests in Louisiana and around the country, and the Department of Justice is investigating.

Shonda Rhimes shuts down petition calling for Jesse Williams to be fired

Williams has been in the news lately after a petition was created calling for him to be fired from Grey's because of remarks he made about police brutality at the BET Awards last month. Since it was created over the holiday weekend, the petition has gained nearly 20,000 signatures. (Based on creator Shonda Rhimes' response, it's extremely unlikely Williams' career will be impacted by the petition.)

But he's not backing down. Here are the tweets he sent on Wednesday regarding Sterling's shooting: