Robert Morse died at the age of 90, his son, Charlie, confirmed on Wednesday.

The “Mad Men” actor’s cause of death is not yet known, according to ABC7.

Morse, born on May 18, 1931 in Newton, MA, earned five Tony Award nominations in his career, most notably a win for his role as J. Pierrepont Finch in the 1961 Broadway production of “How to Succeed in Business Without Really Trying.”

In the early 1990s, Morse earned Tony and Emmy awards for his portrayal of Truman Capote in “Tru.” The acclaimed actor garnered himself five Emmy nominations for his performance as Bertram Cooper on the AMC series “Mad Men.”

Morse is survived by his wife Elizabeth Roberts and his children, Charlie Morse, Robin Morse, Hilary Morse, Andrea Doven.