Lewis Hamilton wore a T-shirt both before and after his victory in Formula 1's Tuscan GP, calling for justice for Breonna Taylor.
F1's six-time champion wore the top on the podium as he collected his winner's trophy and ended his immediate post-race interview by saying: "Justice for Breonna Taylor."
The 26-year-old Taylor, a medical worker, was shot and killed by plain-clothes police officers raiding her home in Louisville, Kentucky, in March.
The front of Hamilton's shirt featured the words 'Arrest the cops who killed Breonna Taylor', while the back contained her picture below the words 'say her name'.
Hamilton first wore the T-shirt ahead of the race when he again took a knee, as F1 drivers gathered in their anti-racism ceremony.
Speaking in subsequent interviews, Hamilton said: "It took me a long time to get that shirt and I've been wanting to wear that and bring awareness to the fact that there's people that have been killed on the street and there's someone that got killed in her own house, and they're in the wrong house, and those guys are still walking free.
"We can't rest, we can't... we have to continue to raise awareness with it."
The Mercedes driver has been a prominent voice in the Black Lives Matter movement and has called for lasting change both inside F1 and society at large.
Hamilton performed the Black Power salute on the podium after winning the Styrian GP in July and is establishing a commission to understand how to widen opportunities for all in motorsport.