Photodissociation dynamics of cyclohexyl cyanide and cyclohexyl isocyanide at 193 nm has been investigated by measuring rotationally resolved laser-induced fluorescence spectra of CN fragments in the ground electronic state. From the spectra, rotational and vibrational energy distributions as well as translational energy releases in the products were obtained. A nonstatistical energy partitioning among products, the cyclohexyl and CN radicals, was observed, but the energy partitioning was very similar for both molecules with large translational energy releases. The dissociation takes place from the excited triplet states, which are strongly repulsive along the reaction coordinate via curve crossing from the initially prepared singlet state.