In these experiments, the dynamics of the three-body dissociative photodetachment of O-3(-) (D2O) at 258 nm are directly probed for the first time. Photodetachment of a negatively charged precursor, with coincident energy analysis of the photoelectron, allows production of energy-selected excited-state O-3(D2O) complexes. By measurement of the laboratory velocities and recoil angles of the O + O-2 + D2O products simultaneously, a kinematically complete description of the three-body dissociation dynamics of O-3(D2O) is obtained. The results show that clustering of D2O to O-3(-) stabilizes the system by 0.75 +/- 0.09 eV. Photodetachment to the triplet states of O-3 in the complex results in three-body dissociation, with no clear evidence observed for quenching or intracluster reaction in the complex. The molecular-frame differential cross section (MF-DCS), showing how the three products scatter in the molecular frame, is presented and discussed in light of DFT calculations of possible equilibrium geometries of the parent O-3(-)(D2O) anion.