Comedian and actor Charlie Murphy, who stepped out of his brother Eddie's shadow as a talent in his own right, has died at 57, according to his publicist.

Murphy died of leukemia, publicist Domenick Nati confirmed with NBC Philadelphia.

Fellow comedian Chris Rock posted a picture of Murphy on Twitter with a message of mourning: "We just lost one of the funniest most real brothers of all time . Charlie Murphy RIP."

Murphy was perhaps best known as an ensemble actor in the comedy "Chapelle's Show," where he told belief-defying stories about spending time with Rick James and Prince. He appeared in movies as well, like "Mo' Betta Blues" and "Night at the Museum," and was a writer on the Eddie Murphy movies "Vampire in Brooklyn" and "Norbit."

His Facebook and Twitter accounts have, of late, been full of short, inspirational messages, including this from Tuesday: "One to Sleep On: Release the past to rest as deeply as possible."

TMZ first reported on Murphy's death, citing Murphy's manager.