Pima County Sheriff Chris Nanos said the results that investigators have received from DNA testing in the Nancy Guthrie case so far haven't led to a suspect.
Activity at Nancy Guthrie's home on Friday included pool maintenance in her backyard. Earlier in the week, a delivery driver accidentally tried to drop off a pizza at the front door. Former FBI special agent Jeff Harp and former FBI supervisory special agent Dennis Franks join CBS News to discuss.