Influential art dealer Brent Sikkema, known for representing renowned artists like Kara Walker and Jeffrey Gibson, was found dead in his Rio de Janeiro apartment. The Brazilian police are investigating his death, as he was discovered with stab wounds. Sikkema, 75, had been a prominent figure in the art world for over 50 years and was known for his gallery's influential roster of artists. His passing comes as a shock to the art community and ahead of a major exhibition by one of his top artists, Jeffrey Gibson. The investigation into his death is ongoing.