Authorities believe they are closing in on the father accused of killing his three daughters and escaping into the Washington wilderness as local police assure the public they are ramping up their urgent search for the triple-homicide suspect. 

​​”You will see a change in our tactics as we proceed forward,” Chelan County Sheriff Mike Morrison said in a news conference Wednesday. “All we need is one mistake and one day to go in our favor and he’s going to be in our custody.”

The comments come after the U.S. Marshals Service deployed its Rapidly Advancing Manhunt (RAM) program as authorities search for Travis Decker, an experienced survivalist and former member of the military accused of killing his three daughters, Paityn, 9; Evelyn, 8; and Olivia, 5. 

Authorities released this image of wanted murder suspect Travis Decker, showing tattoos on both arms and on his left side. He is accused of killing his three young daughters and leaving their bodies at the bottom of a hill at a Washington state campsite. (Courtesy of Chelan County Sheriff’s Office)

Authorities are offering a $20,000 reward for any information leading to Decker’s arrest. If convicted, Decker could face the possibility of life in prison without parole. 

“We will not stop,” U.S. Marshals Service Chief Jerome Brown said. “He just has to make one mistake like the sheriff said. We will find him. He will be brought to justice so the community can heal.” 

Fox News Digital’s Sarah Rumpf-Whitten contributed to this report.