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The decay $\tau^{-}\to K^{-}K_S\nu_{\tau}$ has been studied using$430\times10^6$ $e^+e^-\to \tau^+\tau^-$ events produced at a center-of-massenergy around 10.6 GeV at the PEP-II collider and studied with the BABARdetector. The mass spectrum of the $K^{-}K_S$ system has been measured and thespectral function has been obtained. The measured branching fraction ${\calB}(\tau^{-}\to K^{-}K_S\nu_{\tau}) = (0.739\pm 0.011(\rm stat.)\pm 0.020(\rmsyst.))\times 10^{-3}$ is found to be in agreement with earlier measurements.

Measurement of the spectral function for the $\tau^-\to K^-K_S\nu_{\tau}$ decay in BABAR experiment