Tooley Investigation Winding Down with Few Answers

The investigation into the death of 19 year Colton Tooley is just about at an end. 

The question still remains why did Colton Tooley bring an AK-47 to the UT Austin campus, fire 11 random shots, run into the library and kill himself on the 6th floor.  The answer is still unknown possibly with one exception says UT Austin Police Chief Robert Dahlstrom. "There were some websites that he visited that shows he possibly had some depression."  But Dahlstrom says there were no academic problems, no run ins with campus police, no problems at home, really nothing else to indicate that something like this might happen.  Dahlstrom says they are still awaiting toxicology reports but there is no indication that he was on any kind of prescription medications.