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In 1965 moved to Temuco where they merged with the local football team Deportes Temuco, and since then, they were known as Green Cross Temuco, until 1985 when the club was folded.
Diego moved the following season to Deportes Temuco, Salas' team cross-town rivals, and then he moved to Barnechea, amateur team where was scouted by Unión San Felipe, first-tier club, with which relegated to Primera B in 2012, having very well performances despite of that, among which highlighted a penalty saved to Esteban Paredes in a 1–0 away loss against Colo-Colo at Monumental.
Wirth ever played with regularity at Católica, but in January 2006, was loaned to Deportes Temuco for gain more experience under the three posts, returning the same year in June as the first-choice goalkeeper of Católica for replace to José María Buljubasich, operated of his bening brain tumor.