Keshia Knight Pulliam is honoring her late Cosby Show costar Malcolm-Jamal Warner after his death at age 54. "A week ago I lost my big brother but I gained an angel... I love you... I miss you... We got our girls. ," the 46-year-old actress captioned an Instagram video shared Sunday, July 27. Knight Pulliam included a video of Warner playing a concert at City Winery in Atlanta, as well as a brief clip of two young girls - presumably the pair's daughters - walking with a horse. Knight Pulliam also took to her Instagram Story with a message for her followers.