 A hazing investigation underway following the death of Dartmouth University student 20-year-old Juan Jang. His body found Sunday night after he went missing after a party Saturday. Jang was a biomedical engineering major and a member of the Beta Alpha Omega fraternity. Dartmouth tells us that fraternity, along with the sorority Alpha Phi, had been previously disciplined last fall for alcohol, and Beta Alpha Omega was still on probation. Neither Greek organization has commented. ABC's Trevor Ault.