Yes it is true. If you go to the Archdiocese website, it gives his "biography" and St. Agatha is listed.
For me, he was a good man and I find HARD to believe this. And am still reeling from this news, years later. From everything I read he never acted out on anyone, this may help some people, just knowing that?
http://www.aodonline.org/aodonline-sqlimages/pressreleasestatements/AOD/030213Szott.pdf#search='Fr.%20Timothy%20Szott'