Former roommate and teammate Carlton Dotson , 21 , was arrested and charged with murder July 21 after reportedly telling authorities he shot Dennehy after Dennehy tried to shoot him .
Dotson , 21 , was arrested and charged on July 21 after reportedly telling authorities he shot Dennehy after Dennehy tried to shoot him .
" But the reality is that there needs to be a big structural change , " Dr. Goin added .