We use data collected with the CLEO II detector to perform a high-statistic
s measurement of the resonant substructure in D-0-->K- pi (+)pi (0) decays.
We find that the Dalitz plot is well represented by a combination of seven
quasi-two-body decay channels [(K) over bar*(0)pi (0), K- rho, K*(-)pi (+)
, K-0(1430)(-)pi (+), (K) over bar (0)(1430)(0)pi (0), K- rho+ (1700), and
K*(1680)(-)pi (+)], plus a small non-resonant component. We see no evidence
of a scalar kappa-->K(-)pi (+) resonance in the mass range recently report
ed by other groups. Using the amplitudes and phases from this analysis, we
calculate an integrated CP asymmetry of -0.031 +/- 0.086.