#4 Leonard Nimoy
Star Trek series: Star Trek: The Original Series, Star Trek: The Animated Series
Character name: Spock
Date deceased: February 27th, 2015 (aged 83)
Nimoy first played the role of Spock ― the half-human, half-Vulcan first officer and science officer aboard the USS Enterprise ― in the pilot episode of The Original Series shot in late 1964. He then went on to portray the character in The Animated Series and the first six Star Trek movies. After an almost two-decade Star Trek hiatus, the actor returned to the franchise in the 2009 movie Star Trek as Spock Prime, a role he reprised in the 2013 film Star Trek Into Darkness. Having played Spock on and off from over a period of 49 years, from 1964 to 2013, Nimoy is the longest-serving Star Trek actor of all time.
In February 2015, Nimoy died of complications from chronic obstructive pulmonary disease, a condition he attributed to a smoking addiction he had given up about 30 years earlier. A few days before his death, Nimoy tweeted: “A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP”