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See Leonard Nimoy's touching final tweet

Days before his death, Leonard Nimoy reflected on life and memory in a message posted on his Twitter page.

The tweet, sent Feb. 23, seems even more poignant now in the wake of his death Friday at the age of 83.

A day earlier, he sent another tweet featuring a work of poetry:

Nimoy, best known for playing Mr. Spock on "Star Trek," died from end-stage chronic obstructive pulmonary disease. His tweets were often signed "LLAP" for his character's famous phrase, "live long and prosper."

Go here for more on Nimoy's life and career.