  Using data collected by the Fermilab experiment FOCUS, we measure the
lifetime of the charmed baryon (\Xi_{c}^{o}) using the decay channels
(\Xi_{c}^{o}\to \Xi ^{-}\pi ^{+}) and (\Xi_{c}^{o}\to \Omega ^{-}K^{+}). From a
combined sample of (110\pm 17) events we find (\tau (\Xi_{c}^{o}) =~118^{+
14}_{- 12} \pm5) fs, where the first and second errors are statistical and
systematic, respectively.
