Hill

The Commonwealth appeals from a Superior Court judge’s determination that the petitioner, Michael C. Hill, is no longer a sexually dangerous person (SDP). We *148must determine whether the Commonwealth has a right to appeal from this determination, and, if it does, whether the Superior Court’s decision was erroneous.

I

During the early morning hours of September 4, 1979, Hill, armed with a knife, broke into the house of a former girl friend’s sister. He put a pillow case over her face, undressed her, fondled and raped her, having threatened her children if she resisted. In 1980 the petitioner pied…