Keshia Knight Pulliam is paying tribute to her onscreen "big brother."

The actress, who played Rudy Huxtable on "The Cosby Show," honored her former costar Malcolm-Jamal Warner in an Instagram post on Sunday, July 27, after Warner's death in an accidental drowning.

"A week ago I lost my big brother but I gained an angel ... I love you ... I miss you ... We got our girls," she captioned an Instagram video of Warner playing guitar.

On her Instagram story, Knight Pulliam, 46, also expressed gratitude "for every text, call and all of the love that you have sent my way" since Warner's death, adding that she has "just needed a moment."

Warner, who starred as Rudy's older brother Theo Huxtable on "The Cosby Show" for eight seasons, died on July 20 in a drowning off the coast of Costa Rica. He was 54.