MARINETTE, Wis. (WLUK) -- It's been more than four decades since a Green Bay couple was killed in Marinette County.
Monday, the sheriff said new technology is providing a new look at the person believed to have committed the murders.
It was on this day 42 years ago that David Schuldes, 25, and Ellen Matheys, 24 were shot to death at McClintock Park in Silver Cliff.
"They were engaged to be married. They came up to Marinette County, set up their campsite," said Marinette County Sheriff Jerry Sauve.
Investigators say Matheys was also sexually assaulted before she was killed.
Sauve says new technology using DNA from her clothing has helped make a new break in the case.
"This is no longer an artist conjecture based on what some witnesses are telling them in a sit-down interview," he said. "This is science at work."
For decades, he says an old sketch had been the closest description of the suspect.
But now, a DNA technology company in Virginia hired by the sheriff's department has created new two images.
The one on the left shows what the man would have looked like when the murder occurred in 1976.
The other image shows what the person might look like today.
The sheriff's office says it hired the company back in April.
The agency received the results just a week prior to what marked the 42nd anniversary of the murders.
"It was a matter of weeks when they put this together. And we got it back very recently, and really this wasn't planned to do on the anniversary. It was just kind of how it all fell."
Police say they've followed dozens of leads over the years.
But, they hope this could be the break needed to make an arrest.
"To me this is exciting, it's a heck of a new development in this case," said Sauve.
Mathys' relatives tell FOX 11 they are hopeful the new sketches will lead to arrests and some closure for the family, but declined to talk on-camera about the sketches being released.