Decker is yet to be found over a month after his three daughters Paityn, 9, Evelyn, 8, and Olivia, 5 were found dead on Monday, June 2

According to a press release from the U.S. Marshals Service Greater Idaho Fugitive Task Force, a man matching Decker's description was seen by a family in the Bear Creek area of the Sawtooth National Forest. The vast reserve encompasses over two million acres of land across Idaho and Utah, and will now be the focus of authorities' search efforts.