What's+Eating+Gilbert+Grissom+CK

List the pieces of evidence found List which was most important to solving the crime

-teeth -maggots -bones -picture of girl...watermark? -the van -fingernails in maggots stomach -paint power with one of the bodies -picture of the store in the illustration of the girl

The most important piece of evidence was the fingernail that was found, or possibly the paint powder. Both pieces of evidence tip off the investigators to specific points about the identity of the killer. The powder, they later realize, was from the killer's methods of mixing his own paint, so that the paint itself would be untraceable. The fingernail, too, signifies a specific trait of the killer's methods, which helped the investigators narrow down the suspects until they found him.