FOND DU LAC, Wis. -- Authorities in Wisconsin have made an arrest in the 25-year-old cold case murder of Wisconsin teen Berit Beck, reports the Milwaukee Journal-Sentinel.

Dennis J. Brantner, 61, of Kenosha, was arrested Friday on a warrant for first-degree intentional homicide, reports the paper. Charges were filed Monday, reports the paper.

The eighteen-year-old Beck, of Sturtevant, disappeared in Fond du Lac, about 70 miles north of Milwaukee, in July 1990 as she was on her way to a computer class. Authorities found her body in a ditch about a month later. She had been suffocated and strangled to death.

Fond du Lac County Sheriff's office named Brantner as their prime suspect nearly a year ago. At the time, investigators said newly analyzed evidence suggested Brantner had been in Beck's van.

"In the case, it's been a nightmare since the day it happened. This is the first time we had tangible physical evidence to put someone in the interior of that van," Fond du Lac County Sheriff Mylan Fink reports the Journal Sentinel at the time. "We're actively going forward. It's an ongoing and active investigation."

The paper reported Friday that Brantner's fingerprints were found on a Burger King cup, Beck's employee manual, and a Jolen bleach kit, which she had reportedly purchased the day she vanished.

The Beck family issued a brief statement, reports CBS affiliate WDJT: "We are encouraged and relieved for this day to have arrived for Berit and our family. We request that our privacy be respected as this process unfolds."