Two of the three young men who burglarized a Madison bar in 2008 said detectives told them forensic evidence shows there was a fourth burglar who also was involved in the killing of a UW-Madison student three months earlier. But in separate interviews this week at the Racine Youthful Correctional Institution, Spencer L. Hutchins and Darrielle L. Banks said they know nothing about the strangulation and stabbing death of Brittany Zimmermann. They also denied a fourth burglar was involved in the bar break-in.