Cold case cops are digging up a Pennsylvania wood after receiving 'significant' new evidence about the disappearance of a 15 year-old girl from the area exactly 46 years ago.

Investigators in Media, Pennsylvania, were seen excavating earth from behind a property at the intersection of Indian Lane and Media Station Road on Monday in the hunt for Wendy Eaton.

The intersection is the same spot where search dogs stopped and sat down while following Wendy's scent from her bedroom hours after her disappearance in 1975, indicating the spot where their trail had gone cold.

Wendy disappeared while going to a nearby mall to buy a birthday present for her older brother on May 17 1975. She did so her parents were at a nearby country club, and her two older siblings were off at college. She was last seen just three blocks from her family's home.

Delaware County District Attorney Jack Stollsteimer is among those who believe there may be evidence on the property. Stollsteimer remain tight-lipped about what he believes the evidence to be, who tipped his team off, and why they are now certain Wendy is dead.

He also refused to confirm if investigators are now probing the people who lived in a house close to the wooded area at the time of Wendy's disappearance.

'I believe the State Police have done a remarkable job of getting this case to the position where we’re in right now,' Jack Stollsteimer said. 'Where we think we can find some physical evidence on that property.'

'We certainly can’t talk about individuals or that part of the investigation, but what I can tell you is that property is of interest to us for significant reasons.'

Wendy decided to walk into town and go to the mall to buy a birthday gift for her older brother, Richard, on May 17, 1975, the same day she received her learner's permit. She looked far younger than her age, according to police.

Her family went to play golf at a local country club while Wendy was sunbathing, though she told a friend she was going to get a gift for her brother later.

Wendy's family had chosen the upper middle-class area to raise their kids, believing it to be safe.

They were close to their daughter, who was a good student, active in their local church, and who had no apparent reason to run away from home.

A classmate last saw Wendy standing close to the intersection where police are now hunting around 3:15pm on the afternoon she vanished.

Investigators say a neighbor also spotted Wendy around the same time, but that neighbor she had gone by the time he passed the spot again at 3:17pm.

A Medium article reveals her parents returned home around 5:40pm, only to discover Wendy wasn't home.

'I mean it’s everybody’s worst nightmare,' Pennsylvania State Police Trooper Andrew Martin told NBC10. 'It’s every parent’s worst nightmare.'

'She was just your regular neighborhood girl,' Martin added. 'There was really no indication to suggest a runaway.'

Her family told police that she was planning on attending a singing group rehearsal at church the night she disappeared.

Wendy's father Roland went to the church later to see if she went, but she wasn't there, causing him to panic.

Her parents called the police after contacting Wendy's friends and being unable to figure out her location.

At the time, police dogs were able to trace Eaton's scent from her bedroom straight down Moccasin Trail to Indian Lane, where the scent trailed off. That's where police believe she vanished.

Police did receive a tip the next day that a girl matching Eaton's description called runaway hotline service in Chicago, but it's unclear if Eaton actually placed that call.

They have speculated that it may actually have been someone who harmed Wendy trying to put investigators off the scent, although the caller has never been traced.

The FBI declined Wendy's stricken family's pleas for them to join the investigation because there wasn't clear evidence of an abduction at the time.

In early January 1976, three teens were charged with extortion after they tried to collect a $10,000 payment from Roland for information about Wendy's disappearance, which they did not have.

Various other tips failed to get the family any closer to finding Wendy, who was declared legally dead in August 1983, though it remained a missing persons case.

From there, the case went cold and remained that way until police recently received new information that led them to reframe the case as a homicide investigation.

Wendy's mother Joan died in 1995 and father Roland died in 2007 without ever finding out what happened to their missing daughter.

They spent some time investigating whether Wendy may have been taken in by a local cult, but were ultimately unable to find any evidence to support their theory.

Multiple age progression images have been released in the ensuing years to give an indication as to what Wendy may look like if still alive.

Police did not state what the new leads were, though they expressed confidence that they could now crack the case.

DailyMail.com has reached out to the Pennsylvania State Police for comment.

Wendy was last seen wearing a sleeveless yellow blouse, cut-off blue jean shorts, and white sneakers with a blue stripe, according to The Charley Project.

She was around 4-foot-10 and 90 pounds at the time of her disappearance and would be 61 years old now.

Wendy is deaf in her right ear, with brown eyes and brown hair. She also has pierced ears and may have been wearing braces at the time of her disappearance.

The Pennsylvania State Police are seeking help from the community for information to aid their investigation.