The O-16(alpha, alpha') reaction was studied at theta(lab) = 0 degrees at an incident energy of E-lab = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. Proton decay and a decay from the natural parity states were observed in a large-acceptance silicon strip detector array at backward angles. The coincident charged-particle measurements were used to characterize the decay channels of the theta(+)(6) state in O-16 located at E-x = 15.097(5) MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4-alpha cluster state. The results of this work suggest the presence of a previously unidentified resonance at Ex approximate to 15 MeV that does not exhibit a theta(+) character. This unresolved resonance may have contaminated previous observations of the theta(+)(6) state.