Authorities are investigating a stabbing in Waterloo that resulted in the death of a 29-year-old man. Officials say the stabbing was reported around 4 a.m. Sunday. Police found Waterloo resident John Ladell Bass with a single stab wound in his chest when they arrived. Bass was taken to the hospital where he died. No arrests had been made as of Sunday afternoon, and police were releasing few details about the circumstances that led to the stabbing.