The spring of 1992 became a nightmare for six families whose loved ones were fatally shot by a never-identified man who became known as the I-70 killer. Thirty years later, the murders remain unsolved — but officials hope modern technology will bring answers.

“We definitely have new evidence to test and the advantage of advanced DNA processing on our side. I’m really optimistic,” Det. Kelly Rhodes, task force leader at St. Charles, Mo., police department, tells PEOPLE in this week’s issue.

“We can’t figure out why someone would go on this rampage and just kill people for no apparent reason,” she says. “I can only describe it as evil.”

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