(AP) — Attorneys for a man convicted of a 1988 double murder in Nebraska want to access autopsy records in an effort to find DNA evidence that might free their client.

Attorneys for Jeff Boppre say autopsy records at Regional West Medical Center could identify the nature of the victims’ injuries. They also say it could show what items might contain DNA from the perpetrator of the crime.

Boppre has argued for years that he was framed for the Scottsbluff killings of Richard Valdez and his pregnant girlfriend, Sharon Condon. The Nebraska Supreme Court has upheld his conviction multiple times.