Now it's not only a fingerprint which can link a killer to a crime; a shoe print can be just as telling. Armed with little else, police hoped the shoe impressions found at a Lansing, MI crime scene would put their investigation of Audrey Nichols' murder back on track.

When the head chef of a historic Philadelphia restaurant was found dead, investigators interviewed the usual suspects: family, friends and coworkers. As they sifted through the evidence, police uncovered a chilling tale of debt and deceit.

When a hit-and-run boating accident caused the death of a popular young man, investigators faced the daunting task of searching for one boat among 1200 others. They asked anyone who had seen the accident to come forward. The man who responded did much more than witness the crash; he was a passenger in that other boat.

A woman was found dead on the bedroom floor of her apartment. The crime scene yielded little of value, and investigators wondered if they would find enough evidence to make a case, much less catch a killer. But a bloodstained sheet and a breakthrough forensic technique enabled them to identify the murderer, and convince the jury of his guilt.

When a woman went missing, friends and family were determined to find her. Their worst fears were confirmed weeks later when her body was discovered. Blood evidence and computer forensics helped investigators to catch the killer, and convince the jury of his guilt.