Keshia Knight Pulliam is the latest celebrity to pay tribute to Malcolm-Jamal Warner following his tragic passing. Source: Marcus Ingram / The Washington Post The Cosby Show alum took to Instagram on Sunday, July 2 to honor the memory of her "big brother" following his untimely death on July 20. "A week ago I lost my big brother, but I gained an angel...," Knight Pulliam wrote in her emotional caption. "I love you... I miss you... We got our girls, " referring to Warner's wife and daughter.