Ron Leibman, an actor who enjoyed a six decades-long career in film, television and the theater, died Dec. 6 in Manhattan. He was 82.

Mr. Leibman’s career was highlighted by a Tony Award in 1993 for his performance as Roy Cohn in the first part of “Angels in America.” He also portrayed Cohn in the second part, earning him a Drama Desk nomination for outstanding supporting actor in a play.