Dr. Gur says she believes the gunman's anxiety, depression and delusions became more intense when he returned to school in January 2012.
Dr. Gur reviewed Google chat between the gunman and Gargi Datta on March 2012, where he described homicidal thoughts.
Dr. Gur on Google chat between the gunman and Gargi Datta: "I believe it shows evidence of his psychotic process."
Dr. Gur: "Telling it to Gargi was the next step because it had to be done. Once it's verbalized, it has to be done."
Dr. Gur: "It is a psychotic process. Healthy people don't think this way... a totally irrational way of thinking."
Dr. Gur: "I don't have words... it is so tragic, the results."
Dr Gur: "As long as the thoughts were in his head, they were just thoughts that he could work on controlling, but once you say something you have to pursue and do it.
When something is verbalized, it has to be done. This is very psychotic thinking.”