Born in České Budějovice, Czechoslovakia, he competed in the 1956 Summer Olympics held in Melbourne, Australia, going out in the quarter-finals of the heavyweight event.
He returned to the 1960 Summer Olympics held in Rome, Italy, again as a heavyweight boxer where he went one better, going out in the semi-final to finish in third place.
Němec died in České Budějovice on 10 September 2013, aged 79.
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