Cop’s alleged sexual tryst, genetic testing cited in bid for new trial in decades-old killing in North Chicago

Marvin Williford was convicted of a 2000 attack on Delwin Foxworth. Later, DNA on the weapon was linked to an unidentified man whose DNA was recovered from 11-year-old Holly Staker, who was raped and killed in 1992 in Waukegan. Williford’s DNA wasn’t on that weapon, his lawyers say.