The radiative and nonradiative decay of the (A) over tilde E-2 electronic state of the CH3S radical has been investigated using a variety of experimental techniques. Lifetimes have been measured for a number of vibrational levels; these data have been analyzed along with similar results previously obtained for other methoxy radical family members, CH3O, CD3O, and CF3S. It is concluded that the totality of the data is best described by a model which postulates mode-selective fragmentation into a methyl (or fluoromethyl) radical and an O or S atom. For CH3S there appears a second nonradiative decay channel, possibly producing H + CH2S.