Mad Men co-star Christina Hendricks paid tribute to her colleague: "Robert Morse. What a talent, what a career and what a life. I heard about Robert's passing yesterday but the tears really came this morning when I had time to spend thinking about his extraordinary time on earth and my too brief but significant time working and becoming friends with him".
Morse previously won an Emmy in 1989 for playing Truman Capote in Tru.
Morse's other screen credits include American Crime Story: The People vs OJ Simpson, City of Angels, That's Life and guest roles on Murder, She Wrote, The Twilight Zone, The Dukes of Hazard and Suddenly Susan. His most notable film role was the 1967 movie How to Succeed in Business Without Really Trying.
Morse was also known for his work on stage where he starred in productions including Sugar and Darling. He also originated the role of the Wizard in Wicked during its San Francisco trial run.
Morse was married twice and had five children.