The search for Travis Decker, the father accused of killing his three young daughters, has shifted as the manhunt entered its fourth week, authorities said.

Authorities who have spent the past three weeks searching in the mountains of Washington state for an ex-soldier wanted in the deaths of his three young daughters say there is no evidence that he remains in the area or that he is alive at all.

The massive manhunt for Travis Decker, who is suspected of killing his three daughters and disappearing into the wilderness west of Leavenworth, continues. But officials say the lack of new leads suggests Decker is either dead or no longer in Eastern Washington.