Three court documents used in the criminal investigation of a 1971 cold case have been unsealed.
A judge in Vermillion on May 30 granted a request from Attorney General Marty Jackley to release the 48 pages but without the names of nine reported victims of sexual assault.
Jackley's office released them to reporters early Friday.
Another judge used the documents in 2004 to grant three search warrants at the boyhood home near Alcester of David Lykken , who was indicted for killing Cheryl Miller and Pamella Jackson.
Those charges were later dropped and Jackley said in April the girls died when their Studebaker drove off a gravel road and landed in a creek.
The documents outline the case for the 2004 search warrant of Lykken's former home.
An interview with a neighbor of the Jackson family was a centerpiece of the state's justification for the search. In June 1971, that neighbor reported hearing a party line conversation between Pam Jackson and a man named "David" about a month before the girls' disappearance. In that conversation, David and Jackson talked about having a hangover and mentioning how David slammed Pam's car in a car door. David said he wished he'd had a camera to take pictures of Jackson.
Lykken was arrested for rape and kidnapping in 1990. In interviews with several sexual-assault victims tied to Lykken, many of those interviewed talked about how Lykken had taken sexually-explicit photos of them.
In 2004, another victim told detectives that she remembered seeing a pit around Lykken's former home with bodies in it. That victim also recalled seeing a car similar to the one Jackson and Miller disappeared in.
According to the documents, investigators used the preceding facts, along with Lykken's close proximity to the gravel pit where the party the girls were headed for was held at, along with Lykken's violent criminal history as a basis for the searches.
Lykken is serving a 225-year sentence for an unrelated rape and kidnapping.