The death of the actor was confirmed by Jordan Strohl, a representative for The Actors Fund. Hyman is also renowned for voicing the character Panthro in the animated television series "ThunderCats".
Cosby tweeted Sunday night, "Earle Hyman brought love, dignity and integrity to Grandpa Huxtable".
Hyman played a number of stage roles in Broadway shows like Anna Lucasta, The Merchant of Venice, No Time for Sergeants, Mister Johnson, and Saint Joan among others. The actor was unmarried and had no immediate relatives.More news: A Wrinkle in Time Official US Trailer
Hyman was born in October 11, 1926, in Rocky Mount, North Carolina. His parents Zachariah Hyman and Maria Lilly Plummer moved to Brooklyn, New York, in the 1920s, where Hyman grew up and acquired a taste for acting.
Earle Hyman, a distinguished theater actor who became a familiar face to TV audiences playing Russell Huxtable on "The Cosby Show" (1984-1992), has died at 91, Deadline reports. "It just shot off the charts", Hyman said in 2009 on the podcast "Just My Show".
The actor was a veteran theatre performer, having made his Broadway debut in "Run, Little Chillun" in 1943 and starring in multiple plays over the course of his career. Hyman learned Norwegian and later in life, maintained a second home there, where he also enjoyed a stage career. He received an Emmy nomination for the role in 1986, according to TMZ. People just loved it.