Leonard Nimoy, who played Spock in Star Trek, has died at the age of 83.
The actor passed away at his Bel Air home in Los Angeles this morning with his wife confirming the sad news to The New York Times.
Susan told the publication the cause of death was end-stage chronic obstructive pulmonary disease.
The actor revealed he had the illness last year which he blamed on years of smoking and he was taken to hospital earlier this week after suffering chest pains.
Leonard first appeared as Spock in Star Trek in the first episode in 1966 and reprised the role in 2013 for the film Star Trek Into Darkness.
Before he won his Star Trek role, Leonard was teaching method acting at his own studio and later appeared to express mixed feeling for his sci-fi character, calling his 1977 autobiography I am not Spock, and his 1995 book I Am Spock.
Star Trek was cancelled after three seasons due to low ratings but Leonard gained a cult following due to his performance on the show, and his catchphrase "live long and prosper" became known across the world.
Prior to Star Trek Leonard's breakout part came in 1952 film Kid Monk Baroni in which he played a boxer.
In the following 10 years he had bit parts in 55 movies including The Untouchables, Perry Mason, Get Smart and Doctor Kildare.
The star was an active Twitter user and posted online just a few days before his death.