Keshia Knight Pulliam is speaking out about the sudden passing of her former The Cosby Show co-star Malcolm-Jamal Warner. The actress, 46, shared a heartfelt tribute on Sunday, exactly a week since the 54-year-old's drowning death in Costa Rica. Knight Pulliam posted a clip to her Instagram of The Resident star playing bass guitar onstage in front of a crowd in Atlanta. With the special video, she shared: "A week ago I lost my big brother but I gained an angel... I love you... I miss you... We got our girls.