Mad Men actor Robert Morse has died aged 90, his son Charlie has revealed.
The actor, who is best known for his role as Bertram Cooper in the drama series, passed away on Wednesday night.
His cause of death is not known, according to ABC7.
Tributes flooded in for Robert on social media after news broke of death.
Academy of Motion Picture Arts and Sciences board member Larry Karaszewski wrote: "My good pal Bobby Morse has passed away at age 90.
"A huge talent and a beautiful spirit. Sending love to his son Charlie & daughter Allyn."
Another fan wrote: "RIP Robert Morse - I will always remember to take my shoes off", while a third chimed: "Rest in Peace Robert Morse aka Bert. Definitely left your mark".
A fourth typed: "Rest in peace, Robert Morse. The star of my favourite scene in TV history".
While known for playing the senior partner in the hit series Mad Men, Robert had an illustrious career in Hollywood.
He earned multiple nominations and wins for Tony, Drama Desk and Emmy awards over a period of five decades.
Robert was known for How to Succeed in Business Without Really Trying in which he both starred in the 1961 original Broadway production, for which he won a Tony Award, and the 1967 film adaptation.
He regained new prominence in the late 2000s for his recurring role of elder 1960s New York City businessman Bertram on Mad Men.
Robert was born in Massachusetts and was inspired by his drama teacher Henry Lasker who "knew what I had burning in me and wanted to express".
After graduating, an ambitious Robert pursued his dream of becoming an actor by studying at Neighborhood Playhouse and received his first uncredited role in The Proud and Profane in 1956.
It was when he starred in The Matchmaker on Broadway that he really launched his career.
He went on to win a Tony Award for Best Performance by a Leading Actor in a Play for his portrayal of Truman Capote in Tru in 1989.
And in 1992 he recreated his performance for the PBS series American Playhouse and won the Emmy Award as Best Actor in a Miniseries or Special.
Seven years later, Morse was inducted into the American Theater Hall of Fame thanks to his successful career as a screen and stage actor.
Upon taking on the role of Mad Men, Robert was nominated for a Primetime Emmy Award for Outstanding Guest Actor in a Drama Series in 2008, 2010, 2011, 2013, and 2014.
He was later cast in The People v. O.J. Simpson series as journalist Dominick Dunne. Aged 85, Robert returned to Broadway in the 2016 revival of The Front Page.
Robert was married twice and had five children.
