From the New York Times:
Leonard Nimoy, the sonorous, gaunt-faced actor who won a worshipful global following as Mr. Spock, the resolutely logical human-alien first officer of the Starship Enterprise in the television and movie juggernaut “Star Trek,” died on Friday morning at his home in the Bel Air section of Los Angeles. He was 83.
His wife, Susan Bay Nimoy, confirmed his death, saying the cause was end-stage chronic obstructive pulmonary disease.
Mr. Nimoy announced last year that he had the disease, which he attributed to years of smoking, a habit he had given up three decades earlier. He had been hospitalized earlier in the week.