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LOS ANGELES (AP) — Leonard Nimoy, the actor known and loved by generations of "Star Trek" fans as the pointy-eared, purely logical science officer Mr. Spock, has died.

Nimoy died Friday of end-stage chronic obstructive pulmonary disease at his Los Angeles home, with family at his side, said his son, Adam Nimoy. He was 83.

Although Nimoy followed his 1966-69 "Star Trek" run with a notable career as both an actor and director, in the public's mind he would always be Spock. His half-human, half-Vulcan character was the calm counterpoint to William Shatner's often-emotional Captain Kirk on one of TV and film's most revered cult series.

"He affected the lives of many," Adam Nimoy said. "He was also a great guy and my best friend."

Asked if his father chafed at his fans' close identification of him with his character, Adam Nimoy said, "Not in the least. He loved Spock."

His death drew immediate reaction on Earth and in space.

"I loved him like a brother. We will all miss his humor, his talent and his capacity to love," Shatner said.

"Live Long and Prosper, Mr. #Spock!" tweeted Italian astronaut Samantha Cristoforetti, aboard the International Space Station.

Nimoy displayed ambivalence to the famous role in the titles of his two autobiographies: "I Am Not Spock" (1975) and "I Am Spock" (1995).

After "Star Trek" ended, the actor immediately joined the hit adventure series "Mission Impossible" as Paris, the mission team's master of disguises.

From 1976 to 1982, he hosted the syndicated TV series "In Search of ... ," which attempted to probe such mysteries as the legend of the Loch Ness Monster and the disappearance of aviator Amelia Earhart.

He played Israeli leader Golda Meir's husband opposite Ingrid Bergman in the TV drama "A Woman Called Golda" and Vincent van Gogh in "Vincent," a one-man stage show on the life of the troubled painter. He continued to work well into his 70s, playing gazillionaire genius William Bell in the Fox series "Fringe."

He also directed several films, including the hit comedy "Three Men and a Baby" and appeared in such plays as "A Streetcar Named Desire," ''Cat on a Hot Tim Roof," ''Fiddler on the Roof," ''The King and I," ''My Fair Lady" and "Equus." He also published books of poems, children's stories and his own photographs.

But he could never really escape the role that took him overnight from bit-part actor status to TV star, and in a 1995 interview he sought to analyze the popularity of Spock, the green-blooded space traveler who aspired to live a life based on pure logic.

People identified with Spock because they "recognize in themselves this wish that they could be logical and avoid the pain of anger and confrontation," Nimoy concluded.

"How many times have we come away from an argument wishing we had said and done something different?" he asked.

In the years immediately after "Star Trek" left television, Nimoy tried to shun the role, but he eventually came to embrace it, lampooning himself on such TV shows as "Futurama," ''Duckman" and "The Simpsons" and in commercials.

He became Spock after "Star Trek" creator Gene Roddenberry was impressed by his work in guest appearances on the TV shows "The Lieutenant" and "Dr. Kildare."

The space adventure set in the 23rd century had an unimpressive debut on NBC on Sept. 8, 1966, and it struggled during its three seasons to find an audience other than teenage boys. It seemed headed for oblivion after it was canceled in 1969, but its dedicated legion of fans, who called themselves Trekkies, kept its memory alive with conventions and fan clubs and constant demands that the cast be reassembled for a movie or another TV show.

Trekkies were particularly fond of Spock, often greeting one another with the Vulcan salute and the Vulcan motto, "Live Long and Prosper," both of which Nimoy was credited with bringing to the character. He pointed out, however, that the hand gesture was actually derived from one used by rabbis during Hebraic benedictions.

When the cast finally was reassembled for "Star Trek — The Motion Picture," in 1979, the film was a huge hit and five sequels followed. Nimoy appeared in all of them and directed two. He also guest starred as an older version of himself in some of the episodes of the show's spinoff TV series, "Star Trek: The Next Generation."

"Of course the role changed my career— or rather, gave me one," he once said. "It made me wealthy by most standards and opened up vast opportunities. It also affected me personally, socially, psychologically, emotionally. ... What started out as a welcome job to a hungry actor has become a constant and ongoing influence in my thinking and lifestyle."

In 2009, he was back in a new big-screen version of "Star Trek," this time playing an older Spock who meets his younger self, played by Zachary Quinto. Critic Roger Ebert called the older Spock "the most human character in the film."

Among those seeing the film was President Barack Obama, whose even manner was often likened to Spock's.

"Everybody was saying I was Spock, so I figured I should check it out," Obama said at the time.

Upon the movie's debut, Nimoy told The Associated Press that in his late 70s he was probably closer than ever to being as comfortable with himself as the logical Spock always appeared to be.

"I know where I'm going, and I know where I've been," he said. He reprised the role in the 2013 sequel "Star Trek Into Darkness."

Born in Boston to Jewish immigrants from Russia, Nimoy was raised in an Italian section of the city where, although he counted many Italian-Americans as his friends, he said he also felt the sting of anti-Semitism growing up.

At age 17 he was cast in a local production of Clifford Odets' "Awake and Sing" as the son in a Jewish family.

"This role, the young man surrounded by a hostile and repressive environment, so touched a responsive chord that I decided to make a career of acting," he said later.

He won a drama scholarship to Boston College but eventually dropped out, moved to California and took acting lessons at the Pasadena Playhouse.

Soon he had lost his "Boston dead-end" accent, hired an agent and began getting small roles in TV series and movies. He played a baseball player in "Rhubarb" and an Indian in "Old Overland Trail."

After service in the Army, he returned to Hollywood, working as taxi driver, vacuum cleaner salesman, movie theater usher and other jobs while looking for acting roles.

In 1954 he married Sandra Zober, a fellow student at the Pasadena Playhouse, and they had two children, Julie and Adam. The couple divorced, and in 1988 he married Susan Bay, a film production executive.

Besides his wife, son and daughter, Nimoy is survived by his stepson, Aaron Bay Schuck. Services will be private, Adam Nimoy said.