Nation DNA on a straw helps jury convict man of murder in 1979 slaying of Iowa teen February 25, 2020 Anna Spoerre, The Des Moines Register Comments Off on DNA on a straw helps jury convict man of murder in 1979 slaying of Iowa teen It took just shy of three hours for the jury to return a verdict for Jerry Lee Burns, who was on trial for the 1979 killing of Michelle Martinko.