Leonard Nimoy, the actor, author and director best known for his portrayal of the ultra-logical character Spock in the TV series Star Trek, has died at the age of 83.

His wife, Susan Bay Nimoy, confirmed to the New York Times that her husband died Friday morning at their Los Angeles home of end-stage chronic obstructive pulmonary disease. Nimoy said last year that he had been diagnosed with lung disease and was "doing OK."

Nimoy's poignant last tweet, sent on Feb. 22, reads, "A life is like a garden. Perfect moments can be had, but not preserved, except in memory."

Nimoy played Spock on the original Star Trek series from 1966 to 1969, and resurrected the iconic character in a host of subsequent movies, video games and cameo appearances spanning decades.

"I loved him like a brother," co-star William Shatner said Friday. "We will all miss his humour, his talent, and his capacity to love."

Co-star George Takei shared his condolences on Facebook Friday afternoon.

"Today, the world lost a great man, and I lost a great friend. We return you now to the stars, Leonard ... I shall miss you in so many, many ways," he wrote.

"Leonard Nimoy truly did live long and prosper. To celebrate his life and work, let us share in some of his best moments as the character we all took into our hearts, Mr. Spock."

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

The character's trademark ears, steeply arched eyebrows, well-known Vulcan proverb "Live long and prosper," as well as Nimoy's trademark Vulcan salute helped cement him as a pop culture icon.

It wasn't just the trademark ears or the steeply arched eyebrows — which rose higher when Spock was confronted with disconcerting emotion — or the impressive divided-finger salute or the "Live long and prosper" catchphrase.

It was how Nimoy staunchly turned what could have been a caricature into a dignified, inspiringly intellectual and even touching figure, a half-human, half-Vulcan who was a multicultural and multiethnic touchstone, well before it was hip.

His half-human, half-Vulcan character was the calm counterpoint to Shatner's often-emotional Captain Kirk on one of television 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."

However, Nimoy's ambivalence to the role was reflected in the titles of his two autobiographies, I Am Not Spock (1975) and I Am Spock (1995).

Identifying with Spock

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.

Nimoy played the iconic character Spock from the Star Trek TV and film series. He died Feb. 27, 2015 in Los Angeles. (Bertil Unger/Evening Standard/Getty Images)

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 traveller 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.

'The role changed my career'

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.

Of course the role changed my career— or rather, gave me one. — Leonard Nimoy

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 cancelled 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.

Nimoy's half-human, half-Vulcan character is known for his trademark Vulcan salute. (Todd Korol/Reuters)

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.

Making a career of acting

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.

Everybody was saying I was Spock, so I figured I should check it out. — Barack Obama on seeing the 2009 Star Trek movie

"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 theatre 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.