New details are emerging this morning out of Fort Hood, in Texas, where an army psychiatrist has allegedly killed 13 people and injured 31 during a shooting rampage. Major Nidal Malik Hasan is alive but injured after being shot by a civilian officer. We're joined by Ericka Aguilar, KUT reporter in Fort Hood. Matthew Cassese was stationed at Fort Hood in 2007 and 2008. He remembers a base that was safe, but says soldiers were frequently in trouble for drunken driving. We also talk to Detective First Grade Nick Casale, a former director of counterterrorism for New York City's subway system, about what is involved in a complex criminal investigation.

Here is a press conference from yesterday outside of Fort Hood. This clip shows how confusing it can be during a criminal investigation to get the facts straight. Yesterday they thought it was up to three shooters, one of whom died. Today we know it was one shooter, who is alive, but in critical condition: