Leonard Nimoy, Spock on 'Star Trek,' dead at 83

In his last tweet, posted Monday under his handle @TheRealNimoy, Nimoy himself said: "A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP" Tributes quickly poured in from castmates, other actors, fans and the science community. "I loved him like a brother. We will all miss his humor, his talent, and his capacity to love," said William Shatner, who played the hot-headed Captain James T.