Earlier video diary entries follow a similar theme,often touching on his loneliness and frustration. Shifman acknowledged that the 22-year-old had trouble making friends.
According to Shifman,Rodgers was interviewed by police after his parents flagged their concern but police told the family he was a"perfectly polite,kind and wonderful human".
Shifman said the family were not ready to speak publicly at length but would co-operate with authorities and"any other person who feels that they need to help prevent these situations from ever occurring again".
"My client's mission in life will be to try to prevent any such tragedies from ever happening again,"Shifman said."This country,this world,needs to address mental illness and the ramifications from not recognising these illnesses."
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Shifman said the family is"staunchly"against guns and supported the push for gun-control laws.
"They are extremely,extremely upset that anybody was hurt under these circumstances,"Shifman said.