Serena Williams is the latest athlete join the national conversation of racial injustice in America. The superstar tennis player posted a lengthy message on Facebook on Tuesday to discuss a recent drive with her nephew, who is a black teenager.

"In the distance, I saw a cop on the side of the road. I quickly checked to see if he was obliging by the speed limit. Then I remembered that horrible video of the woman in the car when a cop shot her boyfriend," Williams wrote. "All of this went through my mind in a matter of seconds. I even regretted not driving myself. I would never forgive myself if something happened to my nephew. He's so innocent. So were all 'the others.'"

This is not the first time Williams has approached difficult topics either. In August 2015, she posted a saddening message on Twitter after the death of Christian Taylor after he was shot by police.

Williams added that she almost feels guilty for not speaking out more on the issues in recent months.

"I then wondered 'have I spoken up?' I had to take a look at me. 'What about my nephews? What if I have a son and what about my daughters?' As Dr. Martin Luther King said, 'There comes a time when silence is betrayal,'" Williams wrote. "I won't be silent."

Wink of the CBS Eye to Washington Post