corwin's employer, ben pruitt, had taught a carpentry class at the prison.in's past and wanted to give him a second chance. but when local women started getting attacked, mr. pruitt suspected corwin might be responsible. after the highly publicized attack on wendy gauntt, mr. pruitt remembered something strange from right after the murder of mary risinger. ben pruitt recalls daniel corwin coming to work the day after halloween 1987 with cuts on his hands. narrator: could daniel lee corwin be the man who was attacking local women? it looked that way, but in the absence of any physical evidence -- and there was none -- there was no way to be sure. police procedurals look so simple on tv, and they're just not. you know, even when you know it's somebody, it's not about knowing. you got to prove it. ♪ narrator: texas investigators were familiar with daniel lee corwin. when debra ewing was raped and murdered back in 1987, corwin was brought in for questioning. just hours before debra's murder, corwin had been installing cabinets at the vision center where debra wo