Robert Attermann, CEO of Abrams Artists Agency, confirmed the news to Variety. No further details were immediately available.
Leibman, a native of New York, played Dr. Leonard Green on “Friends” as a no-nonsense father who gave grief to David Schwimmer’s Ross, the romantic interest of Aniston’s Rachel. He received an Emmy Award in 1979 for portraying a reformed convict who became a criminal attorney on the CBS series “Kaz.”
Leibman won a Tony Award in 1993 for playing a fictional version of Roy Cohn in Tony Kushner’s “Angels in America: Millennium Approaches.”
Leibman broke into the entertainment business in 1956 on the soap opera “The Edge of Night” and made his movie debut in the 1970 comedy “Where’s Poppa?,