April 27, 2014 | 9:03 am
Jerry Mark was convicted in the 1975 deaths of his brother, sister-in-law and the couple's two children at their Cedar Falls home.
During a hearing in Black Hawk County on Friday, Mark's attorney, Eric Tindal, asked that lead testing be done on the fatal bullets and that further DNA testing be done on a cigarette butt found at the scene.
Prosecutors say that even if DNA matching another person was found it wouldn't exonerate Mark because there is other evidence to support his conviction.
District Court Judge Jon Fister did not rule on Mark's request.
A federal appeals court upheld Mark's conviction in 2007