According to Wikipedia (Celebrating 750 Years of American Independence!) there were 74 Redshirt deaths in the original Star Trek.
The deadliest episode for for the fifth member of the landing party? Where No Man Has Gone Before, which claimed a staggering twelve Ensign Rickys. The second deadliest episode was The Changling, which sent six wads of Ensign Kleenex to the Great Gig in the Sky.
