Made up of former law enforcement, private investigators and military members, the group of volunteers has located dozens of missing persons over the past few years. This story is part of a series of ...

Investigators searching for Nancy Guthrie, the mother of "Today" show co-host Savannah Guthrie, have uncovered several notable pieces of evidence as they try to identify a suspect.

DNA science has helped solve criminal cases for decades. But increasingly, investigative genetic genealogy — which was first used for cold cases — is helping to solve active cases as well.