20-year-old Matthew Isbell of Marquette Heights and 22-year-old Christine Roush of Washington--the two defendants charged in the July stabbing death of Teresa Ann Poehlman of East Peoria--pleaded not guilty Friday at separate arraignments in McLean County Circuit Court, according to the Pantagraph. Roush is the daughter of the victim. Poelhman's body was found July 2 by hikers on a trail in the Funk's Grove Nature Preserve. According to a previous probable cause statement from the McLean County State's Attorney's office, Roush told Isbell she planned to kill her mother and he was aware of why they were going to Funks Grove. Police continue their for a third suspect.