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Starting from the orthogonal polynomial expansion of a function $F$corresponding to a finite positive Borel measure with infinite compact support,we study the asymptotic behavior of certain associated rational functions(Pad\'{e}-orthogonal approximants). We obtain both direct and inverse resultsrelating the convergence of the poles of the approximants and the singularitiesof $F.$ Thereby, we obtain analogues of the theorems of E. Fabry, R. deMontessus de Ballore, V.I. Buslaev, and S.P. Suetin.

Determining Singularities Using Row Sequences of Pad\'e-orthogonal Approximants