been used in the crime. next, steve derek wanted to see if the black plastic pieces from the crime scene came from this iron. >> so that point became a puzzle. after everything was photographically documented, started gluing the plastic pieces back together. >> after some trial and error, derek discovered the pieces fit perfectly. >> the pieces from the crime scene and the iron created a link to whipple be being at the crime scene. >> investigators also analyzed the athletic shoes found in whipple's possession. they were size 11, the same size as the shoe impressions found in blood at the crime scene. steve derek used standard red fingerprint powder to dust the right shoe. then made an impression on a