(AP) — A prosecutor on Wednesday released composite images of a suspect in the unsolved slaying of a middle school aide nearly a quarter century ago, a rendering that uses genetics to predict someone's appearance. The process, called DNA phenotyping and pioneered by Reston, Virginia-based Parabon NanoLabs, uses genetic material to predict the physical appearance and ancestry of an unknown individual. Ziegert, a 24-year-old teacher's aide at Agawam Middle School, was working the night shift alone at the store when she disappeared April 15, 1992.