In June, William Beeman, who is serving a life sentence in the Iowa Department of Corrections for a 1980 murder, asked a judge to order a DNA evidence test that he contends could prove his innocence. But police agencies involved in the case say they still can’t find the evidence to test. The missing items include a rape kit recovered from the body of the victim, 22-year-old Michiel Winkel, and bloody clothes from the state park where authorities found her dead. Beeman was a local DJ in rural Muscatine County, on the state’s eastern border, when police arrested him for murdering Winkel, who had been an acquaintance. Beeman’s attorneys argue that DNA evidence could shed more light on a crime with multiple suspects, no eyewitnesses, and a confession Beeman claims was coerced by police.