The Washington dad wanted for the murders of his three daughters was spotted on security cameras in the days leading up to the brutal killings as police ramp up their search for the military-trained suspect.

Doorbell footage captured Travis Decker walking up to an unidentified home’s door, knocking on it before strangely sliding his hand up and down the surface, according to video released by the Chelan County Sheriff’s Office on Wednesday evening.

Authorities noted the video was from before the alleged killings, but released the footage as they are the most recent images of Decker.

Decker, 32, is wanted on three counts of murder and kidnapping after the bodies of his three daughters –Paityn, 9, Evelyn, 8, and Olivia, 5 — were discovered in a remote campground near his abandoned truck.

Police also shared two other images of the 32-year-old military veteran that showcased his bushy mustache and goatee.

Decker, who is homeless and has been living out of his truck, also has multiple arm tattoos and was sporting a ponytail in one of the pictures.

He was described as 5 feet 8, 190 pounds, with black hair and brown eyes.

“It is unknown if he is armed at this time, but he should be considered dangerous and should not be contacted or approached,” the sheriff’s department noted.

Decker had picked up his daughters from his ex-wife Whitney Decker’s house for a scheduled custody visit on May 30 and brought them to a campground in the rural Washington state city of Wenatchee.

The girls’ mother reported the trio missing at 9:45 p.m. Friday after her ex-husband failed to return them home.

An endangered missing persons alert was issued Saturday, before it was canceled Monday after police discovered the girls.

Their bodies were found on an embankment at Rock Island Campground, about 18 miles west of the town of Leavenworth, around 5 p.m.

Their bodies were found close to their father’s white 2017 GMC Sierra truck, which allegedly had two bloody handprints smeared on the back.

They were found with plastic bags over their heads and their wrists zip-tied.

Preliminary investigations indicate the girls likely died from asphyxiation.

Officials believe Decker, who was a member of the Washington National Guard since 2021 after transferring from the Active Component, can survive for months off-grid in the wilderness.

“We understand that at times, he would do caching, so we understand that’s a possibility that he could have scoped out this area before, put some supplies out there, and has the ability and knowledge to survive for long periods of time,” Chelan County Sheriff Mike Morrison said at a press conference Wednesday night, KIRO7 reported.

“Thanks to our Marshall’s Office tracking down some good leads that we feel are giving us more of an insight into Travis’ mindset – where he may have gone to,” Morrison added.

A $20,000 reward is available for information leading to Decker’s arrest.