TEXARKANA, Texas — The assistant district attorney prosecuting the sexual assault case against Oklahoma State linebacker Chris Collins has resigned, which may force a delay in the trial. Collins and three other men are accused of sexual assaulting a 12-year-old girl in 2004. Collins' final pre-trial hearing is set for Aug. 20. But on Friday, assistant district attorney Nicole Habersang resigned, along with fellow assistant district attorney Adam Fellows, according a report in Tuesday's Texarkana Gazette, "Circumstances have combined to create a situation that hinders my ability to perform my job properly,” Habersang told the newspaper. "I believe those circumstances have also negatively effected certain parts of the criminal justice system in Bowie County. As a result, my personal moral values — as well as the ethical standards required of the legal professional — force me to stop participating in that system.” The Bowie County district attorney has asked for continuance, but said he has other assistants who will begin handling cases.