The parents of a Cornell University freshman whose dead body was found at the bottom of a gorge after he allegedly was hazed by Phi Kappa Psi fraternity members have launched a 41-page negligence lawsuit against the university, the national fraternity and members of its Cornell chapter.

The parents and plaintiffs lawyer David Bianchi not only contend that each defendant committed negligence leading to the death of 18-year-old Antonio Tsialas, they also contend vigorously that each defendant party, from the university and its police department to Phi Kappa Psi, have refused to give Tsialas’ parents any meaningful information linked to their son’s death and the ensuing investigation after his body was discovered Oct. 26.